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0
$\frac{m}{n}$ is the Irreducible fraction value of \[3+\frac{1}{3+\frac{1}{3+\frac13}}\], what is the value of $m+n$?
$\frac{m}{n}$์€ \[3+\frac{1}{3+\frac{1}{3+\frac13}}\]์˜ ๊ธฐ์•ฝ๋ถ„์ˆ˜ ๊ฐ’์ด๋‹ค. $m+n$์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
142
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_1
1
How many ways are there to split the integers $1$ through $14$ into $7$ pairs such that in each pair, the greater number is at least $2$ times the lesser number?
์ •์ˆ˜ $1$๋ถ€ํ„ฐ $14$๊นŒ์ง€๋ฅผ $7$๊ฐœ์˜ ์Œ์œผ๋กœ ๋‚˜๋ˆ„๋Š” ๋ฐฉ๋ฒ•์˜ ์ˆ˜๋Š” ๋ช‡ ๊ฐœ์ธ๊ฐ€? ๋‹จ, ๊ฐ ์Œ์—์„œ ํฐ ์ˆ˜๋Š” ์ž‘์€ ์ˆ˜์˜ ์ ์–ด๋„ $2$๋ฐฐ ์ด์ƒ์ด์–ด์•ผ ํ•œ๋‹ค.
144
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_10
2
What is the product of all real numbers $x$ such that the distance on the number line between $\log_6x$ and $\log_69$ is twice the distance on the number line between $\log_610$ and $1$?
์ˆ˜์ง์„ ์—์„œ $\log_6x$์™€ $\log_69$ ์‚ฌ์ด์˜ ๊ฑฐ๋ฆฌ๊ฐ€ $\log_610$๊ณผ $1$ ์‚ฌ์ด์˜ ๊ฑฐ๋ฆฌ์˜ ๋‘ ๋ฐฐ๊ฐ€ ๋˜๋Š” ๋ชจ๋“  ์‹ค์ˆ˜ $x$์˜ ๊ณฑ์€ ์–ผ๋งˆ์ธ๊ฐ€?
81
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_11
3
Let $M$ be the midpoint of $\overline{AB}$ in regular tetrahedron $ABCD$. $\frac{p}{q}=\cos(\angle CMD)$ is irreducible fraction, what is the value of $p+q$?
์ •์‚ฌ๋ฉด์ฒด $ABCD$์—์„œ $\overline{AB}$์˜ ์ค‘์ ์„ $M$์ด๋ผ๊ณ  ํ•˜์ž. $\frac{p}{q}=\cos(\angle CMD)$๊ฐ€ ๊ธฐ์•ฝ๋ถ„์ˆ˜์ผ ๋•Œ, $p+q$์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
4
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_12
4
Let $\mathcal{R}$ be the region in the complex plane consisting of all complex numbers $z$ that can be written as the sum of complex numbers $z_1$ and $z_2$, where $z_1$ lies on the segment with endpoints $3$ and $4i$, and $z_2$ has magnitude at most $1$. What integer is closest to the area of $\mathcal{R}$?
๋ณต์†Œํ‰๋ฉด์—์„œ ์˜์—ญ $\mathcal{R}$์€ ๋‘ ๋ณต์†Œ์ˆ˜ $z_1$๊ณผ $z_2$์˜ ํ•ฉ์œผ๋กœ ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋Š” ๋ชจ๋“  ๋ณต์†Œ์ˆ˜ $z$๋กœ ๊ตฌ์„ฑ๋œ๋‹ค. ์—ฌ๊ธฐ์„œ $z_1$์€ ๋์ ์ด $3$๊ณผ $4i$์ธ ์„ ๋ถ„ ์œ„์— ์žˆ๊ณ , $z_2$์€ ํฌ๊ธฐ๊ฐ€ ์ตœ๋Œ€ $1$์ธ ๋ณต์†Œ์ˆ˜์ž…๋‹ˆ๋‹ค. $\mathcal{R}$์˜ ๋„“์ด์— ๊ฐ€์žฅ ๊ฐ€๊นŒ์šด ์ •์ˆ˜๋Š” ๋ฌด์—‡์ž…๋‹ˆ๊นŒ?
13
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_13
5
What is the value of \[(\log 5)^{3}+(\log 20)^{3}+(\log 8)(\log 0.25)\] where $\log$ denotes the base-ten logarithm?
๋ฐ‘์ด 10์ธ ๋กœ๊ทธ $\log$๋ฅผ ์‚ฌ์šฉํ•  ๋•Œ, \[(\log 5)^{3}+(\log 20)^{3}+(\log 8)(\log 0.25)\]์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
2
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_14
6
The roots of the polynomial $10x^3 - 39x^2 + 29x - 6$ are the height, length, and width of a rectangular box (right rectangular prism). A new rectangular box is formed by lengthening each edge of the original box by $2$ units. What is the volume of the new box?
๋‹คํ•ญ์‹ $10x^3 - 39x^2 + 29x - 6$์˜ ๊ทผ์€ ์ง์œก๋ฉด์ฒด์˜ ๋†’์ด, ๊ธธ์ด, ๋„ˆ๋น„์ด๋‹ค. ์›๋ž˜ ์ง์œก๋ฉด์ฒด์˜ ๊ฐ ๋ชจ์„œ๋ฆฌ์˜ ๊ธธ์ด๋ฅผ $2$ ๋งŒํผ ๋Š˜๋ ค ์ƒˆ๋กœ์šด ์ง์œก๋ฉด์ฒด๋ฅผ ๋งŒ๋“ค์—ˆ๋‹ค. ์ƒˆ๋กœ์šด ์ง์œก๋ฉด์ฒด์˜ ๋ถ€ํ”ผ๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
30
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_15
7
A $\emph{triangular number}$ is a positive integer that can be expressed in the form $t_n = 1+2+3+\cdots+n$, for some positive integer $n$. The three smallest triangular numbers that are also perfect squares are $t_1 = 1 = 1^2$, $t_8 = 36 = 6^2$, and $t_{49} = 1225 = 35^2$. What is the sum of the digits of the fourth smallest triangular number that is also a perfect square?
$\emph{triangular number}$ (์‚ผ๊ฐ์ˆ˜)๋Š” ์–ด๋–ค ์–‘์˜ ์ •์ˆ˜ $n$์— ๋Œ€ํ•ด $t_n = 1+2+3+\cdots+n$ ํ˜•ํƒœ๋กœ ํ‘œํ˜„๋  ์ˆ˜ ์žˆ๋Š” ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. ์™„์ „์ œ๊ณฑ์ˆ˜์ด๊ธฐ๋„ ํ•œ ๊ฐ€์žฅ ์ž‘์€ ์„ธ ์‚ผ๊ฐ์ˆ˜๋Š” $t_1 = 1 = 1^2$, $t_8 = 36 = 6^2$, ๊ทธ๋ฆฌ๊ณ  $t_{49} = 1225 = 35^2$์ด๋‹ค. ์™„์ „์ œ๊ณฑ์ˆ˜์ด๊ธฐ๋„ ํ•œ ๋„ค ๋ฒˆ์งธ๋กœ ์ž‘์€ ์‚ผ๊ฐ์ˆ˜์˜ ๊ฐ ์ž๋ฆฟ์ˆ˜์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
18
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_16
8
Suppose $a$ is a real number such that the equation \[a\cdot(\sin{x}+\sin{(2x)}) = \sin{(3x)}\] has more than one solution in the interval $(0, \pi)$. The set of all such $a$ that can be written in the form \[(p,q) \cup (q,r),\] where $p, q,$ and $r$ are real numbers with $p < q< r$. What is $p+q+r$?
๊ตฌ๊ฐ„ $(0, \pi)$์—์„œ ๋ฐฉ์ •์‹ \[a\cdot(\sin{x}+\sin{(2x)}) = \sin{(3x)}\]์ด ๋‘ ๊ฐœ ์ด์ƒ์˜ ํ•ด๋ฅผ ๊ฐ–๋„๋ก ํ•˜๋Š” ์‹ค์ˆ˜ $a$๊ฐ€ ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜์ž. ์ด๋Ÿฌํ•œ ๋ชจ๋“  $a$์˜ ์ง‘ํ•ฉ์€ $p < q < r$์ธ ์‹ค์ˆ˜ $p, q, r$์— ๋Œ€ํ•ด \[(p,q) \cup (q,r)\] ํ˜•ํƒœ๋กœ ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค. $p+q+r$์€ ์–ผ๋งˆ์ธ๊ฐ€?
-4
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_17
9
Let $T_k$ be the transformation of the coordinate plane that first rotates the plane $k$ degrees counterclockwise around the origin and then reflects the plane across the $y$-axis. What is the least positive integer $n$ such that performing the sequence of transformations $T_1, T_2, T_3, \cdots, T_n$ returns the point $(1,0)$ back to itself?
์ขŒํ‘œ ํ‰๋ฉด์„ ์›์ ์„ ์ค‘์‹ฌ์œผ๋กœ ๋ฐ˜์‹œ๊ณ„ ๋ฐฉํ–ฅ์œผ๋กœ $k$๋„ ํšŒ์ „์‹œํ‚จ ๋‹ค์Œ $y$์ถ•์— ๋Œ€ํ•ด ๋Œ€์นญ ์ด๋™์‹œํ‚ค๋Š” ๋ณ€ํ™˜์„ $T_k$๋ผ๊ณ  ํ•˜์ž. ๋ณ€ํ™˜ $T_1, T_2, T_3, \cdots, T_n$์„ ์ˆœ์ฐจ์ ์œผ๋กœ ์ˆ˜ํ–‰ํ–ˆ์„ ๋•Œ ์  $(1,0)$์ด ๋‹ค์‹œ ์ž๊ธฐ ์ž์‹ ์œผ๋กœ ๋Œ์•„์˜ค๋Š” ๊ฐ€์žฅ ์ž‘์€ ์–‘์˜ ์ •์ˆ˜ $n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
359
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_18
10
Suppose that $13$ cards numbered $1, 2, 3, \ldots, 13$ are arranged in a row. The task is to pick them up in numerically increasing order, working repeatedly from left to right. In the example below, cards $1, 2, 3$ are picked up on the first pass, $4$ and $5$ on the second pass, $6$ on the third pass, $7, 8, 9, 10$ on the fourth pass, and $11, 12, 13$ on the fifth pass. For how many of the $13!$ possible orderings of the cards will the $13$ cards be picked up in exactly two passes?
$1$๋ถ€ํ„ฐ $13$๊นŒ์ง€ ๋ฒˆํ˜ธ๊ฐ€ ๋งค๊ฒจ์ง„ $13$์žฅ์˜ ์นด๋“œ๊ฐ€ ํ•œ ์ค„๋กœ ๋ฐฐ์—ด๋˜์–ด ์žˆ๋‹ค. ์™ผ์ชฝ์—์„œ ์˜ค๋ฅธ์ชฝ์œผ๋กœ ๋ฐ˜๋ณต์ ์œผ๋กœ ์ž‘์—…ํ•˜๋ฉด์„œ ์ˆซ์ž๊ฐ€ ์ฆ๊ฐ€ํ•˜๋Š” ์ˆœ์„œ๋Œ€๋กœ ์นด๋“œ๋ฅผ ์ง‘์–ด ์˜ฌ๋ฆฌ๋Š” ๊ฒƒ์ด ๋ชฉํ‘œ์ด๋‹ค. ์•„๋ž˜ ์˜ˆ์—์„œ ์นด๋“œ $1, 2, 3$์€ ์ฒซ ๋ฒˆ์งธ ํŒจ์Šค์—์„œ, $4$์™€ $5$๋Š” ๋‘ ๋ฒˆ์งธ ํŒจ์Šค์—์„œ, $6$์€ ์„ธ ๋ฒˆ์งธ ํŒจ์Šค์—์„œ, $7, 8, 9, 10$์€ ๋„ค ๋ฒˆ์งธ ํŒจ์Šค์—์„œ, $11, 12, 13$์€ ๋‹ค์„ฏ ๋ฒˆ์งธ ํŒจ์Šค์—์„œ ์ง‘์–ด ์˜ฌ๋ฆฐ๋‹ค. $13!$๊ฐœ์˜ ๊ฐ€๋Šฅํ•œ ์นด๋“œ ์ˆœ์„œ ์ค‘ ์ •ํ™•ํžˆ ๋‘ ๋ฒˆ์˜ ํŒจ์Šค๋กœ $13$์žฅ์˜ ์นด๋“œ๋ฅผ ๋ชจ๋‘ ์ง‘์–ด ์˜ฌ๋ฆด ์ˆ˜ ์žˆ๋Š” ๊ฒฝ์šฐ์˜ ์ˆ˜๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
8,178
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_19
11
The sum of three numbers is $96.$ The first number is $6$ times the third number, and the third number is $40$ less than the second number. What is the absolute value of the difference between the first and second numbers?
์„ธ ์ˆ˜์˜ ํ•ฉ์€ $96$์ด๋‹ค. ์ฒซ ๋ฒˆ์งธ ์ˆ˜๋Š” ์„ธ ๋ฒˆ์งธ ์ˆ˜์˜ $6$๋ฐฐ์ด๊ณ , ์„ธ ๋ฒˆ์งธ ์ˆ˜๋Š” ๋‘ ๋ฒˆ์งธ ์ˆ˜๋ณด๋‹ค $40$ ์ž‘๋‹ค. ์ฒซ ๋ฒˆ์งธ ์ˆ˜์™€ ๋‘ ๋ฒˆ์งธ ์ˆ˜์˜ ์ฐจ์ด์˜ ์ ˆ๋Œ“๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
5
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_2
12
Isosceles trapezoid $ABCD$ has parallel sides $\overline{AD}$ and $\overline{BC},$ with $BC < AD$ and $AB = CD.$ There is a point $P$ in the plane such that $PA=1, PB=2, PC=3,$ and $PD=4.$ Let $\frac{r}{s}=frac{BC}{AD}$ is irreducible fraction, what is the value of $r+s$?
๋“ฑ๋ณ€์‚ฌ๋‹ค๋ฆฌ๊ผด $ABCD$๋Š” ํ‰ํ–‰ํ•œ ๋ณ€ $\overline{AD}$์™€ $\overline{BC}$๋ฅผ ๊ฐ€์ง€๊ณ  ์žˆ์œผ๋ฉฐ, $BC < AD$์ด๊ณ  $AB = CD$์ด๋‹ค. ํ‰๋ฉด์— $PA=1, PB=2, PC=3,$ ๊ทธ๋ฆฌ๊ณ  $PD=4$๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์  $P$๊ฐ€ ์žˆ๋‹ค. $\frac{r}{s}=frac{BC}{AD}$๊ฐ€ ๊ธฐ์•ฝ๋ถ„์ˆ˜์ผ ๋•Œ, $r+s$์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
4
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_20
14
Let $c$ be a real number, and let $z_1$ and $z_2$ be the two complex numbers satisfying the equation $z^2 - cz + 10 = 0$. Points $z_1$, $z_2$, $\frac{1}{z_1}$, and $\frac{1}{z_2}$ are the vertices of (convex) quadrilateral $\mathcal{Q}$ in the complex plane. When the area of $\mathcal{Q}$ obtains its maximum possible value, let $c=\sqrt{m}$. what is the value of m
$c$๋ฅผ ์‹ค์ˆ˜๋ผ๊ณ  ํ•˜๊ณ , $z_1$๊ณผ $z_2$๋ฅผ ๋ฐฉ์ •์‹ $z^2 - cz + 10 = 0$์„ ๋งŒ์กฑํ•˜๋Š” ๋‘ ๋ณต์†Œ์ˆ˜๋ผ๊ณ  ํ•˜์ž. ์  $z_1$, $z_2$, $\frac{1}{z_1}$, ๊ทธ๋ฆฌ๊ณ  $\frac{1}{z_2}$๋Š” ๋ณต์†Œํ‰๋ฉด์—์„œ (๋ณผ๋ก) ์‚ฌ๊ฐํ˜• $\mathcal{Q}$์˜ ๊ผญ์ง“์ ์ด๋‹ค. $\mathcal{Q}$์˜ ๋„“์ด๊ฐ€ ์ตœ๋Œ“๊ฐ’์„ ๊ฐ€์งˆ ๋•Œ, $c=\sqrt{m}$์ด๋ผ๊ณ  ํ•˜์ž. m์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
20
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_22
15
Let $h_n$ and $k_n$ be the unique relatively prime positive integers such that \[\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{n}=\frac{h_n}{k_n}.\] Let $L_n$ denote the least common multiple of the numbers $1, 2, 3, \ldots, n$. For how many integers with $1\le{n}\le{22}$ is $k_n<L_n$?
$h_n$๊ณผ $k_n$์„ \[\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{n}=\frac{h_n}{k_n}.\] ์„ ๋งŒ์กฑํ•˜๋Š” ์œ ์ผํ•œ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜๋ผ๊ณ  ํ•˜์ž. $L_n$์„ $1, 2, 3, \ldots, n$์˜ ์ตœ์†Œ๊ณต๋ฐฐ์ˆ˜๋ผ๊ณ  ํ•˜์ž. $1\le{n}\le{22}$์ธ ์ •์ˆ˜ $n$ ์ค‘ $k_n<L_n$์„ ๋งŒ์กฑํ•˜๋Š” $n$์˜ ๊ฐœ์ˆ˜๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
8
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_23
16
How many strings of length $5$ formed from the digits $0$, $1$, $2$, $3$, $4$ are there such that for each $j \in \{1,2,3,4\}$, at least $j$ of the digits are less than $j$? (For example, $02214$ satisfies this condition because it contains at least $1$ digit less than $1$, at least $2$ digits less than $2$, at least $3$ digits less than $3$, and at least $4$ digits less than $4$. The string $23404$ does not satisfy the condition because it does not contain at least $2$ digits less than $2$.)
์ˆซ์ž $0$, $1$, $2$, $3$, $4$๋กœ ์ด๋ฃจ์–ด์ง„ ๊ธธ์ด๊ฐ€ $5$์ธ ๋ฌธ์ž์—ด ์ค‘ ๊ฐ $j \in \{1,2,3,4\}$์— ๋Œ€ํ•ด $j$๋ณด๋‹ค ์ž‘์€ ์ˆซ์ž๊ฐ€ ์ ์–ด๋„ $j$๊ฐœ ์ด์ƒ ์žˆ๋Š” ๋ฌธ์ž์—ด์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€? (์˜ˆ๋ฅผ ๋“ค์–ด, $02214$๋Š” $1$๋ณด๋‹ค ์ž‘์€ ์ˆซ์ž๊ฐ€ ์ ์–ด๋„ $1$๊ฐœ, $2$๋ณด๋‹ค ์ž‘์€ ์ˆซ์ž๊ฐ€ ์ ์–ด๋„ $2$๊ฐœ, $3$๋ณด๋‹ค ์ž‘์€ ์ˆซ์ž๊ฐ€ ์ ์–ด๋„ $3$๊ฐœ, $4$๋ณด๋‹ค ์ž‘์€ ์ˆซ์ž๊ฐ€ ์ ์–ด๋„ $4$๊ฐœ ์žˆ์œผ๋ฏ€๋กœ ์ด ์กฐ๊ฑด์„ ๋งŒ์กฑํ•œ๋‹ค. ๋ฌธ์ž์—ด $23404$๋Š” $2$๋ณด๋‹ค ์ž‘์€ ์ˆซ์ž๊ฐ€ ์ ์–ด๋„ $2$๊ฐœ ์—†์œผ๋ฏ€๋กœ ์กฐ๊ฑด์„ ๋งŒ์กฑํ•˜์ง€ ์•Š๋Š”๋‹ค.)
1,296
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_24
17
A circle with integer radius $r$ is centered at $(r, r)$. Distinct line segments of length $c_i$ connect points $(0, a_i)$ to $(b_i, 0)$ for $1 \le i \le 14$ and are tangent to the circle, where $a_i$, $b_i$, and $c_i$ are all positive integers and $c_1 \le c_2 \le \cdots \le c_{14}$. What is the ratio $\frac{c_{14}}{c_1}$ for the least possible value of $r$?
์ •์ˆ˜ ๋ฐ˜์ง€๋ฆ„ $r$์„ ๊ฐ–๋Š” ์›์˜ ์ค‘์‹ฌ์ด $(r, r)$์— ์žˆ๋‹ค. ๊ธธ์ด๊ฐ€ $c_i$์ธ ์„œ๋กœ ๋‹ค๋ฅธ ์„ ๋ถ„๋“ค์ด ์  $(0, a_i)$์—์„œ $(b_i, 0)$๊นŒ์ง€ ์—ฐ๊ฒฐ๋˜์–ด ์žˆ์œผ๋ฉฐ ($1 \le i \le 14$), ์ด ์„ ๋ถ„๋“ค์€ ์›์— ์ ‘ํ•ฉ๋‹ˆ๋‹ค. ์—ฌ๊ธฐ์„œ $a_i$, $b_i$, $c_i$๋Š” ๋ชจ๋‘ ์–‘์˜ ์ •์ˆ˜์ด๊ณ  $c_1 \le c_2 \le \cdots \le c_{14}$์ž…๋‹ˆ๋‹ค. $r$์˜ ์ตœ์†Ÿ๊ฐ’์— ๋Œ€ํ•ด $\frac{c_{14}}{c_1}$์˜ ๋น„์œจ์€ ์–ผ๋งˆ์ธ๊ฐ€?
17
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_25
19
The least common multiple of a positive integer $n$ and $18$ is $180$, and the greatest common divisor of $n$ and $45$ is $15$. What is the sum of the digits of $n$?
์–‘์˜ ์ •์ˆ˜ $n$๊ณผ $18$์˜ ์ตœ์†Œ๊ณต๋ฐฐ์ˆ˜๋Š” $180$์ด๊ณ , $n$๊ณผ $45$์˜ ์ตœ๋Œ€๊ณต์•ฝ์ˆ˜๋Š” $15$์ด๋‹ค. $n$์˜ ๊ฐ ์ž๋ฆฟ์ˆ˜์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
6
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_4
20
The $\textit{taxicab distance}$ between points $(x_1, y_1)$ and $(x_2, y_2)$ in the coordinate plane is given by \[|x_1 - x_2| + |y_1 - y_2|.\] For how many points $P$ with integer coordinates is the taxicab distance between $P$ and the origin less than or equal to $20$?
์ขŒํ‘œ ํ‰๋ฉด์—์„œ ์  $(x_1, y_1)$๊ณผ $(x_2, y_2)$ ์‚ฌ์ด์˜ $\textit{taxicab distance}$ (ํƒ์‹œ ๊ฑฐ๋ฆฌ)๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์ด ์ฃผ์–ด์ง„๋‹ค. \[|x_1 - x_2| + |y_1 - y_2|.\] ์ •์ˆ˜ ์ขŒํ‘œ๋ฅผ ๊ฐ–๋Š” ์  $P$ ์ค‘ ์›์ ๊ณผ์˜ ํƒ์‹œ ๊ฑฐ๋ฆฌ๊ฐ€ $20$ ์ดํ•˜์ธ ์ ์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€?
841
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_5
21
A data set consists of $6$ (not distinct) positive integers: $1$, $7$, $5$, $2$, $5$, and $X$. The average (arithmetic mean) of the $6$ numbers equals a value in the data set. What is the sum of all possible values of $X$?
๋ฐ์ดํ„ฐ์„ธํŠธ๋Š” $6$๊ฐœ์˜ (์„œ๋กœ ๋‹ค๋ฅด์ง€ ์•Š์„ ์ˆ˜ ์žˆ๋Š”) ์–‘์˜ ์ •์ˆ˜๋กœ ๊ตฌ์„ฑ๋œ๋‹ค: $1$, $7$, $5$, $2$, $5$, $X$. $6$๊ฐœ ์ˆซ์ž์˜ ํ‰๊ท (์‚ฐ์ˆ  ํ‰๊ท )์€ ๋ฐ์ดํ„ฐ ์„ธํŠธ์— ์žˆ๋Š” ๊ฐ’๊ณผ ๊ฐ™์Šต๋‹ˆ๋‹ค. $X$์˜ ๊ฐ€๋Šฅํ•œ ๋ชจ๋“  ๊ฐ’์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
36
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_6
23
The infinite product \[\sqrt[3]{10} \cdot \sqrt[3]{\sqrt[3]{10}} \cdot \sqrt[3]{\sqrt[3]{\sqrt[3]{10}}} \cdots\] evaluates to a real number $\sqrt{m}$. What is the value of m?
๋ฌดํ•œ ๊ณฑ \[\sqrt[3]{10} \cdot \sqrt[3]{\sqrt[3]{10}} \cdot \sqrt[3]{\sqrt[3]{\sqrt[3]{10}}} \cdots\] ์€ ์‹ค์ˆ˜ $\sqrt{m}$์œผ๋กœ ์ˆ˜๋ ดํ•œ๋‹ค. $m$์˜ ๊ฐ’์€ ๋ฌด์—‡์ธ๊ฐ€?
10
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_8
24
On Halloween $31$ children walked into the principal's office asking for candy. They can be classified into three types: Some always lie; some always tell the truth; and some alternately lie and tell the truth. The alternaters arbitrarily choose their first response, either a lie or the truth, but each subsequent statement has the opposite truth value from its predecessor. The principal asked everyone the same three questions in this order. "Are you a truth-teller?" The principal gave a piece of candy to each of the $22$ children who answered yes. "Are you an alternater?" The principal gave a piece of candy to each of the $15$ children who answered yes. "Are you a liar?" The principal gave a piece of candy to each of the $9$ children who answered yes. How many pieces of candy in all did the principal give to the children who always tell the truth?
ํ• ๋กœ์œˆ์— 31๋ช…์˜ ์•„์ด๋“ค์ด ์‚ฌํƒ•์„ ๋‹ฌ๋ผ๊ณ  ๊ต์žฅ ์„ ์ƒ๋‹˜ ์‚ฌ๋ฌด์‹ค์— ๋“ค์–ด๊ฐ”๋‹ค. ์•„์ด๋“ค์€ ์„ธ ๊ฐ€์ง€ ์œ ํ˜•์œผ๋กœ ๋ถ„๋ฅ˜ํ•  ์ˆ˜ ์žˆ๋‹ค: ํ•ญ์ƒ ๊ฑฐ์ง“๋ง์„ ํ•˜๋Š” ์•„์ด๋“ค, ํ•ญ์ƒ ์ง„์‹ค์„ ๋งํ•˜๋Š” ์•„์ด๋“ค, ๊ทธ๋ฆฌ๊ณ  ๊ฑฐ์ง“๋ง๊ณผ ์ง„์‹ค์„ ๋ฒˆ๊ฐˆ์•„ ๋งํ•˜๋Š” ์•„์ด๋“ค. ๋ฒˆ๊ฐˆ์•„ ๋งํ•˜๋Š” ์•„์ด๋“ค์€ ์ฒซ ๋ฒˆ์งธ ๋Œ€๋‹ต์„ ๊ฑฐ์ง“๋ง์ด๋‚˜ ์ง„์‹ค ์ค‘์—์„œ ์ž„์˜๋กœ ์„ ํƒํ•˜์ง€๋งŒ, ๊ทธ ์ดํ›„์˜ ๊ฐ ์ง„์ˆ ์€ ์ด์ „ ์ง„์ˆ ๊ณผ ๋ฐ˜๋Œ€๋˜๋Š” ์ง„๋ฆฌ ๊ฐ’์„ ๊ฐ–๋Š”๋‹ค. ๊ต์žฅ ์„ ์ƒ๋‹˜์€ ๋ชจ๋“  ์•„์ด๋“ค์—๊ฒŒ ๋‹ค์Œ ์„ธ ๊ฐ€์ง€ ์งˆ๋ฌธ์„ ๊ฐ™์€ ์ˆœ์„œ๋กœ ํ–ˆ๋‹ค. "๋„ˆ๋Š” ์ง„์‹ค์„ ๋งํ•˜๋Š” ์•„์ด๋‹ˆ?" ๊ต์žฅ ์„ ์ƒ๋‹˜์€ "์˜ˆ"๋ผ๊ณ  ๋Œ€๋‹ตํ•œ 22๋ช…์˜ ์•„์ด๋“ค ๊ฐ๊ฐ์—๊ฒŒ ์‚ฌํƒ•์„ ํ•œ ๊ฐœ์”ฉ ์ฃผ์—ˆ๋‹ค. "๋„ˆ๋Š” ๋ฒˆ๊ฐˆ์•„ ๋งํ•˜๋Š” ์•„์ด๋‹ˆ?" ๊ต์žฅ ์„ ์ƒ๋‹˜์€ "์˜ˆ"๋ผ๊ณ  ๋Œ€๋‹ตํ•œ 15๋ช…์˜ ์•„์ด๋“ค ๊ฐ๊ฐ์—๊ฒŒ ์‚ฌํƒ•์„ ํ•œ ๊ฐœ์”ฉ ์ฃผ์—ˆ๋‹ค. "๋„ˆ๋Š” ๊ฑฐ์ง“๋ง์Ÿ์ด๋‹ˆ?" ๊ต์žฅ ์„ ์ƒ๋‹˜์€ "์˜ˆ"๋ผ๊ณ  ๋Œ€๋‹ตํ•œ 9๋ช…์˜ ์•„์ด๋“ค ๊ฐ๊ฐ์—๊ฒŒ ์‚ฌํƒ•์„ ํ•œ ๊ฐœ์”ฉ ์ฃผ์—ˆ๋‹ค. ๊ต์žฅ ์„ ์ƒ๋‹˜์€ ํ•ญ์ƒ ์ง„์‹ค์„ ๋งํ•˜๋Š” ์•„์ด๋“ค์—๊ฒŒ ์ด ๋ช‡ ๊ฐœ์˜ ์‚ฌํƒ•์„ ์ฃผ์—ˆ๋Š”๊ฐ€?
7
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12A_Problems/Problem_9
25
Define $x\diamond y$ to be $|x-y|$ for all real numbers $x$ and $y.$ What is the value of \[((1\diamond2)\diamond3)-(1\diamond(2\diamond3))?\]
๋ชจ๋“  ์‹ค์ˆ˜ $x$์™€ $y$์— ๋Œ€ํ•ด $x\diamond y$๋ฅผ $|x-y|$๋กœ ์ •์˜ํ•œ๋‹ค. \[((1\diamond2)\diamond3)-(1\diamond(2\diamond3))\]์˜ ๊ฐ’์€ ๋ฌด์—‡์ธ๊ฐ€?
2
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_1
27
Let $f(n) = \left( \frac{-1+i\sqrt{3}}{2} \right)^n + \left( \frac{-1-i\sqrt{3}}{2} \right)^n$, where $i = \sqrt{-1}$. What is $f(2022)$?
$i = \sqrt{-1}$์ผ ๋•Œ, $f(n) = \left( \frac{-1+i\sqrt{3}}{2} \right)^n + \left( \frac{-1-i\sqrt{3}}{2} \right)^n$์ด๋ผ๊ณ  ํ•˜์ž. $f(2022)$๋Š” ๋ฌด์—‡์ธ๊ฐ€?
2
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_11
28
Kayla rolls four fair $6$-sided dice. What is the denominator minus the numerator of the probability that at least one of the numbers Kayla rolls is greater than 4 and at least two of the numbers she rolls are greater than 2?
Kayla๋Š” ๋„ค ๊ฐœ์˜ ๊ณต์ •ํ•œ 6๋ฉด์ฒด ์ฃผ์‚ฌ์œ„๋ฅผ ๊ตด๋ฆฐ๋‹ค. Kayla๊ฐ€ ๊ตด๋ ค์„œ ์–ป์€ ์ˆซ์ž๋“ค ์ค‘ ์ ์–ด๋„ ํ•˜๋‚˜๋Š” 4๋ณด๋‹ค ํฌ๊ณ  ์ ์–ด๋„ ๋‘ ๊ฐœ๋Š” 2๋ณด๋‹ค ํด ํ™•๋ฅ ์˜ ๋ถ„๋ชจ์—์„œ ๋ถ„์ž๋ฅผ ๋บ€ ๊ฐ’์€ ๋ฌด์—‡์ธ๊ฐ€?
20
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_12
29
The diagram below shows a rectangle with side lengths $4$ and $8$ and a square with side length $5$. Three vertices of the square lie on three different sides of the rectangle, as shown. What is the numerator of the simplest fraction that represents the area of the region inside both the square and the rectangle?
์•„๋ž˜ ๊ทธ๋ฆผ์€ ๊ฐ€๋กœ ๊ธธ์ด๊ฐ€ $4$์ด๊ณ  ์„ธ๋กœ ๊ธธ์ด๊ฐ€ $8$์ธ ์ง์‚ฌ๊ฐํ˜•๊ณผ ํ•œ ๋ณ€์˜ ๊ธธ์ด๊ฐ€ $5$์ธ ์ •์‚ฌ๊ฐํ˜•์„ ๋ณด์—ฌ์ค€๋‹ค. ๊ทธ๋ฆผ๊ณผ ๊ฐ™์ด ์ •์‚ฌ๊ฐํ˜•์˜ ์„ธ ๊ผญ์ง“์ ์€ ์ง์‚ฌ๊ฐํ˜•์˜ ์„ธ ๋ณ€ ์œ„์— ์žˆ๋‹ค. ์ง์‚ฌ๊ฐํ˜•๊ณผ ์ •์‚ฌ๊ฐํ˜• ๋ชจ๋‘์— ์†ํ•˜๋Š” ์˜์—ญ์˜ ๋„“์ด๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” ๊ธฐ์•ฝ๋ถ„์ˆ˜์˜ ๋ถ„์ž๋Š” ๋ฌด์—‡์ธ๊ฐ€? [asy] size(5cm); filldraw((4,0)--(8,3)--(8-3/4,4)--(1,4)--cycle,mediumgray); draw((0,0)--(8,0)--(8,4)--(0,4)--cycle,linewidth(1.1)); draw((1,0)--(1,4)--(4,0)--(8,3)--(5,7)--(1,4),linewidth(1.1)); label("$4$", (8,2), E); label("$8$", (4,0), S); label("$5$", (3,11/2), NW); draw((1,.35)--(1.35,.35)--(1.35,0),linewidth(1.1)); [/asy]
5
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_13
30
The graph of $y=x^2+2x-15$ intersects the $x$-axis at points $A$ and $C$ and the $y$-axis at point $B$. What is the numerator of the simplest fraction that represents $\tan(\angle ABC)$?
$y=x^2+2x-15$์˜ ๊ทธ๋ž˜ํ”„๋Š” $x$-์ถ•๊ณผ ์  $A$์™€ $C$์—์„œ ๊ต์ฐจํ•˜๊ณ  $y$-์ถ•๊ณผ ์  $B$์—์„œ ๊ต์ฐจํ•œ๋‹ค. $\tan(\angle ABC)$๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” ๊ธฐ์•ฝ๋ถ„์ˆ˜์˜ ๋ถ„์ž๋Š” ๋ฌด์—‡์ธ๊ฐ€?
4
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_14
33
How many $4 \times 4$ arrays whose entries are $0$s and $1$s are there such that the row sums (the sum of the entries in each row) are $1, 2, 3,$ and $4,$ in some order, and the column sums (the sum of the entries in each column) are also $1, 2, 3,$ and $4,$ in some order? Output the remainder when the answer is divided by 100. For example, the array \[\left[ \begin{array}{cccc} 1 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 \\ \end{array} \right]\] satisfies the condition.
๊ฐ ํ•ญ๋ชฉ์ด $0$ ๋˜๋Š” $1$์ธ $4 \times 4$ ๋ฐฐ์—ด ์ค‘์—์„œ ํ–‰ ํ•ฉ(๊ฐ ํ–‰์˜ ํ•ญ๋ชฉ ํ•ฉ)์ด ์–ด๋–ค ์ˆœ์„œ๋กœ $1, 2, 3, 4$์ด๊ณ  ์—ด ํ•ฉ(๊ฐ ์—ด์˜ ํ•ญ๋ชฉ ํ•ฉ)๋„ ์–ด๋–ค ์ˆœ์„œ๋กœ $1, 2, 3, 4$์ธ ๋ฐฐ์—ด์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€? ๋‹ต์„ 100์œผ๋กœ ๋‚˜๋ˆˆ ๋‚˜๋จธ์ง€๋ฅผ ์ถœ๋ ฅํ•˜์‹œ์˜ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ๋ฐฐ์—ด \[\left[ \begin{array}{cccc} 1 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 \\ \end{array} \right]\] ์€ ์กฐ๊ฑด์„ ๋งŒ์กฑํ•œ๋‹ค.
76
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_17
34
Each square in a $5 \times 5$ grid is either filled or empty, and has up to eight adjacent neighboring squares, where neighboring squares share either a side or a corner. The grid is transformed by the following rules: Any filled square with two or three filled neighbors remains filled. Any empty square with exactly three filled neighbors becomes a filled square. All other squares remain empty or become empty. A sample transformation is shown in the figure below. Suppose the $5 \times 5$ grid has a border of empty squares surrounding a $3 \times 3$ subgrid. How many initial configurations will lead to a transformed grid consisting of a single filled square in the center after a single transformation? (Rotations and reflections of the same configuration are considered different.)
$5 \times 5$ ๊ฒฉ์ž์˜ ๊ฐ ์ •์‚ฌ๊ฐํ˜•์€ ์ฑ„์›Œ์ ธ ์žˆ๊ฑฐ๋‚˜ ๋น„์–ด ์žˆ์œผ๋ฉฐ, ์ตœ๋Œ€ 8๊ฐœ์˜ ์ธ์ ‘ํ•œ ์ด์›ƒ ์ •์‚ฌ๊ฐํ˜•์„ ๊ฐ€์ง„๋‹ค. ์—ฌ๊ธฐ์„œ ์ด์›ƒ ์ •์‚ฌ๊ฐํ˜•์€ ๋ณ€ ๋˜๋Š” ๋ชจ์„œ๋ฆฌ๋ฅผ ๊ณต์œ ํ•œ๋‹ค. ๊ฒฉ์ž๋Š” ๋‹ค์Œ ๊ทœ์น™์— ๋”ฐ๋ผ ๋ณ€ํ™˜๋œ๋‹ค. ์ฑ„์›Œ์ง„ ์ด์›ƒ์ด 2๊ฐœ ๋˜๋Š” 3๊ฐœ์ธ ์ฑ„์›Œ์ง„ ์ •์‚ฌ๊ฐํ˜•์€ ์ฑ„์›Œ์ง„ ์ƒํƒœ๋กœ ์œ ์ง€๋œ๋‹ค. ์ฑ„์›Œ์ง„ ์ด์›ƒ์ด ์ •ํ™•ํžˆ 3๊ฐœ์ธ ๋นˆ ์ •์‚ฌ๊ฐํ˜•์€ ์ฑ„์›Œ์ง„ ์ •์‚ฌ๊ฐํ˜•์ด ๋œ๋‹ค. ๋‹ค๋ฅธ ๋ชจ๋“  ์ •์‚ฌ๊ฐํ˜•์€ ๊ณ„์† ๋น„์–ด ์žˆ๊ฑฐ๋‚˜ ๋น„์–ด ์žˆ๊ฒŒ ๋œ๋‹ค. ์ƒ˜ํ”Œ ๋ณ€ํ™˜์€ ์•„๋ž˜ ๊ทธ๋ฆผ์— ๋‚˜์™€ ์žˆ๋‹ค. [asy] import geometry; unitsize(0.6cm); void ds(pair x) { filldraw(x -- (1,0) + x -- (1,1) + x -- (0,1)+x -- cycle,mediumgray,invisible); } ds((1,1)); ds((2,1)); ds((3,1)); ds((1,3)); for (int i = 0; i <= 5; ++i) { draw((0,i)--(5,i)); draw((i,0)--(i,5)); } label("Initial", (2.5,-1)); draw((6,2.5)--(8,2.5),Arrow); ds((10,2)); ds((11,1)); ds((11,0)); for (int i = 0; i <= 5; ++i) { draw((9,i)--(14,i)); draw((i+9,0)--(i+9,5)); } label("Transformed", (11.5,-1)); [/asy] $5 \times 5$ ๊ฒฉ์ž์— $3 \times 3$ ํ•˜์œ„ ๊ฒฉ์ž๋ฅผ ๋‘˜๋Ÿฌ์‹ผ ๋นˆ ์ •์‚ฌ๊ฐํ˜• ํ…Œ๋‘๋ฆฌ๊ฐ€ ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜์ž. ๋‹จ์ผ ๋ณ€ํ™˜ ํ›„ ์ค‘์•™์— ์ฑ„์›Œ์ง„ ์ •์‚ฌ๊ฐํ˜•์ด ํ•˜๋‚˜๋งŒ ์žˆ๋Š” ๋ณ€ํ™˜๋œ ๊ฒฉ์ž๋กœ ์ด์–ด์ง€๋Š” ์ดˆ๊ธฐ ๊ตฌ์„ฑ์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€? (๋™์ผํ•œ ๊ตฌ์„ฑ์˜ ํšŒ์ „ ๋ฐ ๋ฐ˜์‚ฌ๋Š” ๋‹ค๋ฅด๊ฒŒ ๊ฐ„์ฃผ๋œ๋‹ค.)
22
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_18
35
In $\triangle{ABC}$ medians $\overline{AD}$ and $\overline{BE}$ intersect at $G$ and $\triangle{AGE}$ is equilateral. Then $\cos(C)$ can be written as $\frac{m\sqrt p}n$, where $m$ and $n$ are relatively prime positive integers and $p$ is a positive integer not divisible by the square of any prime. What is $m+n+p?$
$\triangle{ABC}$์—์„œ ์ค‘์„  $\overline{AD}$์™€ $\overline{BE}$๋Š” $G$์—์„œ ๊ต์ฐจํ•˜๊ณ  $\triangle{AGE}$๋Š” ์ •์‚ผ๊ฐํ˜•์ด๋‹ค. ๊ทธ๋Ÿฌ๋ฉด $\cos(C)$๋Š” $\frac{m\sqrt p}n$์œผ๋กœ ์“ธ ์ˆ˜ ์žˆ๋‹ค. ์—ฌ๊ธฐ์„œ $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๊ณ  $p$๋Š” ์–ด๋–ค ์†Œ์ˆ˜์˜ ์ œ๊ณฑ์œผ๋กœ๋„ ๋‚˜๋ˆ„์–ด์ง€์ง€ ์•Š๋Š” ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n+p$๋Š” ๋ฌด์—‡์ธ๊ฐ€?
44
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_19
36
In rhombus $ABCD$, point $P$ lies on segment $\overline{AD}$ so that $\overline{BP}$ $\perp$ $\overline{AD}$, $AP = 3$, and $PD = 2$. What is the area of $ABCD$? (Note: The figure is not drawn to scale.)
๋งˆ๋ฆ„๋ชจ $ABCD$์—์„œ ์  $P$๋Š” ์„ ๋ถ„ $\overline{AD}$ ์œ„์— ์žˆ์–ด $\overline{BP}$ $\perp$ $\overline{AD}$, $AP = 3$, ๊ทธ๋ฆฌ๊ณ  $PD = 2$๋ฅผ ๋งŒ์กฑํ•œ๋‹ค. $ABCD$์˜ ๋„“์ด๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
20
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_2
37
Let $P(x)$ be a polynomial with rational coefficients such that when $P(x)$ is divided by the polynomial $x^2 + x + 1$, the remainder is $x+2$, and when $P(x)$ is divided by the polynomial $x^2+1$, the remainder is $2x+1$. There is a unique polynomial of least degree with these two properties. What is the sum of the squares of the coefficients of that polynomial?
$P(x)$๋ฅผ ์œ ๋ฆฌ์ˆ˜ ๊ณ„์ˆ˜๋ฅผ ๊ฐ–๋Š” ๋‹คํ•ญ์‹์ด๋ผ๊ณ  ํ•˜์ž. $P(x)$๋ฅผ ๋‹คํ•ญ์‹ $x^2 + x + 1$๋กœ ๋‚˜๋ˆ„๋ฉด ๋‚˜๋จธ์ง€๊ฐ€ $x+2$์ด๊ณ , $P(x)$๋ฅผ ๋‹คํ•ญ์‹ $x^2+1$๋กœ ๋‚˜๋ˆ„๋ฉด ๋‚˜๋จธ์ง€๊ฐ€ $2x+1$์ด๋‹ค. ์ด ๋‘ ๊ฐ€์ง€ ์„ฑ์งˆ์„ ๋งŒ์กฑํ•˜๋Š” ์ตœ์†Œ ์ฐจ์ˆ˜์˜ ๋‹คํ•ญ์‹์€ ์œ ์ผํ•˜๊ฒŒ ์กด์žฌํ•œ๋‹ค. ๊ทธ ๋‹คํ•ญ์‹์˜ ๊ณ„์ˆ˜๋“ค์˜ ์ œ๊ณฑ์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
23
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_20
38
Let $S$ be the set of circles in the coordinate plane that are tangent to each of the three circles with equations $x^{2}+y^{2}=4$, $x^{2}+y^{2}=64$, and $(x-5)^{2}+y^{2}=3$. What is the sum of the areas of all circles in $S$?Output the remainder when the answer is divided by 100.
$S$๋ฅผ ์ขŒํ‘œํ‰๋ฉด์—์„œ ๋ฐฉ์ •์‹ $x^{2}+y^{2}=4$, $x^{2}+y^{2}=64$, ๊ทธ๋ฆฌ๊ณ  $(x-5)^{2}+y^{2}=3$์„ ๊ฐ–๋Š” ์„ธ ์›์— ๊ฐ๊ฐ ์ ‘ํ•˜๋Š” ์›๋“ค์˜ ์ง‘ํ•ฉ์ด๋ผ๊ณ  ํ•˜์ž. $S$์— ์žˆ๋Š” ๋ชจ๋“  ์›๋“ค์˜ ๋„“์ด์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€? ๋‹ต์„ 100์œผ๋กœ ๋‚˜๋ˆˆ ๋‚˜๋จธ์ง€๋ฅผ ์ถœ๋ ฅํ•˜์‹œ์˜ค.
36
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_21
39
Ant Amelia starts on the number line at $0$ and crawls in the following manner. For $n=1,2,3,$ Amelia chooses a time duration $t_n$ and an increment $x_n$ independently and uniformly at random from the interval $(0,1).$ During the $n$th step of the process, Amelia moves $x_n$ units in the positive direction, using up $t_n$ minutes. If the total elapsed time has exceeded $1$ minute during the $n$th step, she stops at the end of that step; otherwise, she continues with the next step, taking at most $3$ steps in all. What is the denominator plus the numerator of thethe probability that Ameliaโ€™s position when she stops will be greater than $1$?
๊ฐœ๋ฏธ Amelia๋Š” ์ˆ˜์ง์„ ์—์„œ $0$์—์„œ ์‹œ์ž‘ํ•˜์—ฌ ๋‹ค์Œ๊ณผ ๊ฐ™์€ ๋ฐฉ์‹์œผ๋กœ ๊ธฐ์–ด๊ฐ„๋‹ค. $n=1,2,3,$์— ๋Œ€ํ•ด Amelia๋Š” ์‹œ๊ฐ„ ๊ฐ„๊ฒฉ $t_n$๊ณผ ์ฆ๋ถ„ $x_n$์„ ๊ตฌ๊ฐ„ $(0,1)$์—์„œ ๋…๋ฆฝ์ ์ด๊ณ  ๊ท ์ผํ•˜๊ฒŒ ๋ฌด์ž‘์œ„๋กœ ์„ ํƒํ•œ๋‹ค. ๊ณผ์ •์˜ $n$๋ฒˆ์งธ ๋‹จ๊ณ„ ๋™์•ˆ Amelia๋Š” $t_n$๋ถ„์„ ์‚ฌ์šฉํ•˜์—ฌ ์–‘์˜ ๋ฐฉํ–ฅ์œผ๋กœ $x_n$๋งŒํผ ์ด๋™ํ•œ๋‹ค. $n$๋ฒˆ์งธ ๋‹จ๊ณ„ ๋™์•ˆ ์ด ๊ฒฝ๊ณผ ์‹œ๊ฐ„์ด $1$๋ถ„์„ ์ดˆ๊ณผํ•˜๋ฉด ํ•ด๋‹น ๋‹จ๊ณ„์˜ ๋์—์„œ ๋ฉˆ์ถ˜๋‹ค. ๊ทธ๋ ‡์ง€ ์•Š์œผ๋ฉด ์ตœ๋Œ€ $3$๋‹จ๊ณ„๊นŒ์ง€ ๋‹ค์Œ ๋‹จ๊ณ„๋ฅผ ๊ณ„์†ํ•œ๋‹ค. Amelia๊ฐ€ ๋ฉˆ์ถœ ๋•Œ์˜ ์œ„์น˜๊ฐ€ $1$๋ณด๋‹ค ํด ํ™•๋ฅ ์˜ ๋ถ„๋ชจ์™€ ๋ถ„์ž์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
5
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_22
40
Let $x_0,x_1,x_2,\dotsc$ be a sequence of numbers, where each $x_k$ is either $0$ or $1$. For each positive integer $n$, define \[S_n = \sum_{k=0}^{n-1} x_k 2^k\] Suppose $7S_n \equiv 1 \pmod{2^n}$ for all $n \geq 1$. What is the value of the sum \[x_{2019} + 2x_{2020} + 4x_{2021} + 8x_{2022}?\]
$x_0,x_1,x_2,\dotsc$๋ฅผ ๊ฐ $x_k$๊ฐ€ $0$ ๋˜๋Š” $1$์ธ ์ˆ˜์—ด์ด๋ผ๊ณ  ํ•˜์ž. ๊ฐ ์–‘์˜ ์ •์ˆ˜ $n$์— ๋Œ€ํ•ด \[S_n = \sum_{k=0}^{n-1} x_k 2^k\] ๋ผ๊ณ  ์ •์˜ํ•œ๋‹ค. ๋ชจ๋“  $n \geq 1$์— ๋Œ€ํ•ด $7S_n \equiv 1 \pmod{2^n}$์ด๋ผ๊ณ  ๊ฐ€์ •ํ•˜์ž. ํ•ฉ \[x_{2019} + 2x_{2020} + 4x_{2021} + 8x_{2022}\] ์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
6
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_23
41
The figure below depicts a regular $7$-gon inscribed in a unit circle. [asy] import geometry; unitsize(3cm); draw(circle((0,0),1),linewidth(1.5)); for (int i = 0; i < 7; ++i) { for (int j = 0; j < i; ++j) { draw(dir(i * 360/7) -- dir(j * 360/7),linewidth(1.5)); } } for(int i = 0; i < 7; ++i) { dot(dir(i * 360/7),5+black); } [/asy] What is the sum of the $4$th powers of the lengths of all $21$ of its edges and diagonals?Output the remainder when the answer is divided by 100.
์•„๋ž˜ ๊ทธ๋ฆผ์€ ๋‹จ์œ„ ์›์— ๋‚ด์ ‘ํ•˜๋Š” ์ •$7$๊ฐํ˜•์„ ๋‚˜ํƒ€๋‚ธ๋‹ค. [asy] import geometry; unitsize(3cm); draw(circle((0,0),1),linewidth(1.5)); for (int i = 0; i < 7; ++i) { for (int j = 0; j < i; ++j) { draw(dir(i * 360/7) -- dir(j * 360/7),linewidth(1.5)); } } for(int i = 0; i < 7; ++i) { dot(dir(i * 360/7),5+black); } [/asy] ๋ชจ๋“  21๊ฐœ์˜ ๋ณ€๊ณผ ๋Œ€๊ฐ์„  ๊ธธ์ด์˜ 4์ œ๊ณฑ์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€? ๋‹ต์„ 100์œผ๋กœ ๋‚˜๋ˆˆ ๋‚˜๋จธ์ง€๋ฅผ ์ถœ๋ ฅํ•˜์‹œ์˜ค.
47
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_24
42
Four regular hexagons surround a square with side length 1, each one sharing an edge with the square, as shown in the figure below. The area of the resulting 12-sided outer nonconvex polygon can be written as $m \sqrt{n} + p$, where $m$, $n$, and $p$ are integers and $n$ is not divisible by the square of any prime. What is the absolute value of $m+n+p$? [asy] import geometry; unitsize(3cm); draw((0,0) -- (1,0) -- (1,1) -- (0,1) -- cycle); draw(shift((1/2,1-sqrt(3)/2))*polygon(6)); draw(shift((1/2,sqrt(3)/2))*polygon(6)); draw(shift((sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw(shift((1-sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw((0,1-sqrt(3))--(1,1-sqrt(3))--(3-sqrt(3),sqrt(3)-2)--(sqrt(3),0)--(sqrt(3),1)--(3-sqrt(3),3-sqrt(3))--(1,sqrt(3))--(0,sqrt(3))--(sqrt(3)-2,3-sqrt(3))--(1-sqrt(3),1)--(1-sqrt(3),0)--(sqrt(3)-2,sqrt(3)-2)--cycle,linewidth(2)); [/asy]
์•„๋ž˜ ๊ทธ๋ฆผ๊ณผ ๊ฐ™์ด ๋„ค ๊ฐœ์˜ ์ •์œก๊ฐํ˜•์ด ํ•œ ๋ณ€์˜ ๊ธธ์ด๊ฐ€ 1์ธ ์ •์‚ฌ๊ฐํ˜•์„ ๋‘˜๋Ÿฌ์‹ธ๊ณ  ์žˆ์œผ๋ฉฐ, ๊ฐ ์œก๊ฐํ˜•์€ ์ •์‚ฌ๊ฐํ˜•๊ณผ ํ•œ ๋ณ€์„ ๊ณต์œ ํ•œ๋‹ค. ๊ฒฐ๊ณผ์ ์œผ๋กœ ์ƒ์„ฑ๋œ 12๊ฐํ˜•์˜ ์˜ค๋ชฉ ๋‹ค๊ฐํ˜•์˜ ๋„“์ด๋Š” $m \sqrt{n} + p$๋กœ ์“ธ ์ˆ˜ ์žˆ๋‹ค. ์—ฌ๊ธฐ์„œ $m$, $n$, $p$๋Š” ์ •์ˆ˜์ด๊ณ  $n$์€ ์–ด๋–ค ์†Œ์ˆ˜์˜ ์ œ๊ณฑ์œผ๋กœ๋„ ๋‚˜๋ˆ„์–ด์ง€์ง€ ์•Š๋Š”๋‹ค. $m+n+p$์˜ ์ ˆ๋Œ“๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€? [asy] import geometry; unitsize(3cm); draw((0,0) -- (1,0) -- (1,1) -- (0,1) -- cycle); draw(shift((1/2,1-sqrt(3)/2))*polygon(6)); draw(shift((1/2,sqrt(3)/2))*polygon(6)); draw(shift((sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw(shift((1-sqrt(3)/2,1/2))*rotate(90)*polygon(6)); draw((0,1-sqrt(3))--(1,1-sqrt(3))--(3-sqrt(3),sqrt(3)-2)--(sqrt(3),0)--(sqrt(3),1)--(3-sqrt(3),3-sqrt(3))--(1,sqrt(3))--(0,sqrt(3))--(sqrt(3)-2,3-sqrt(3))--(1-sqrt(3),1)--(1-sqrt(3),0)--(sqrt(3)-2,sqrt(3)-2)--cycle,linewidth(2)); [/asy]
4
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_25
43
How many of the first ten numbers of the sequence $121, 11211, 1112111, \ldots$ are prime numbers?
์ˆ˜์—ด $121, 11211, 1112111, \ldots$์˜ ์ฒ˜์Œ 10๊ฐœ ์ˆซ์ž ์ค‘ ์†Œ์ˆ˜๋Š” ๋ช‡ ๊ฐœ์ธ๊ฐ€?
0
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_3
44
For how many values of the constant $k$ will the polynomial $x^{2}+kx+36$ have two distinct integer roots?
๋‹คํ•ญ์‹ $x^{2}+kx+36$์ด ๋‘ ๊ฐœ์˜ ์„œ๋กœ ๋‹ค๋ฅธ ์ •์ˆ˜ ๊ทผ์„ ๊ฐ–๋„๋ก ํ•˜๋Š” ์ƒ์ˆ˜ $k$์˜ ๊ฐ’์€ ๋ช‡๊ฐœ์ธ๊ฐ€?
8
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_4
45
What is the sum of the x and y coordinates of the new position of the point $(-1, -2)$ after rotating $270^{\circ}$ counterclockwise about the point $(3, 1)$?
์  $(3, 1)$์„ ์ค‘์‹ฌ์œผ๋กœ ์  $(-1, -2)$๋ฅผ $270^{\circ}$ ๋ฐ˜์‹œ๊ณ„ ๋ฐฉํ–ฅ์œผ๋กœ ํšŒ์ „ํ•œ ์ƒˆ๋กœ์šด ์ ์˜ ์œ„์น˜์˜ x ๋ฐ y ์ขŒํ‘œ์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
5
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_5
46
Consider the following $100$ sets of $10$ elements each: \begin{align*} &\{1,2,3,\ldots,10\}, \\ &\{11,12,13,\ldots,20\},\\ &\{21,22,23,\ldots,30\},\\ &\vdots\\ &\{991,992,993,\ldots,1000\}. \end{align*} How many of these sets contain exactly two multiples of $7$?
๋‹ค์Œ๊ณผ ๊ฐ™์€ 10๊ฐœ์˜ ์›์†Œ๋ฅผ ๊ฐ€์ง„ 100๊ฐœ์˜ ์ง‘ํ•ฉ์„ ์ƒ๊ฐํ•ด๋ณด์‹œ์˜ค: \begin{align*} &\{1,2,3,\ldots,10\}, \\ &\{11,12,13,\ldots,20\},\\ &\{21,22,23,\ldots,30\},\\ &\vdots\\ &\{991,992,993,\ldots,1000\}. \end{align*} ์ด ์ง‘ํ•ฉ๋“ค ์ค‘ 7์˜ ๋ฐฐ์ˆ˜๋ฅผ ์ •ํ™•ํžˆ ๋‘ ๊ฐœ ํฌํ•จํ•˜๋Š” ์ง‘ํ•ฉ์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€?
42
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_6
47
Camila writes down five positive integers. The unique mode of these integers is $2$ greater than their median, and the median is $2$ greater than their arithmetic mean. What is the least possible value for the mode?
Camila๋Š” ๋‹ค์„ฏ ๊ฐœ์˜ ์–‘์˜ ์ •์ˆ˜๋ฅผ ์ ๋Š”๋‹ค. ์ด ์ •์ˆ˜๋“ค์˜ ์œ ์ผํ•œ ์ตœ๋นˆ๊ฐ’์€ ์ค‘์•™๊ฐ’๋ณด๋‹ค 2๋งŒํผ ํฌ๊ณ , ์ค‘์•™๊ฐ’์€ ์‚ฐ์ˆ  ํ‰๊ท ๋ณด๋‹ค 2๋งŒํผ ํฌ๋‹ค. ์ตœ๋นˆ๊ฐ’์˜ ์ตœ์†Ÿ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
11
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_7
49
The sequence $a_0,a_1,a_2,\cdots$ is a strictly increasing arithmetic sequence of positive integers such that \[2^{a_7}=2^{27} \cdot a_7.\] What is the minimum possible value of $a_2$?
์ˆ˜์—ด $a_0,a_1,a_2,\cdots$๋Š” ์–‘์˜ ์ •์ˆ˜๋กœ ์ด๋ฃจ์–ด์ง„ ์ˆœ์ฆ๊ฐ€ํ•˜๋Š” ๋“ฑ์ฐจ์ˆ˜์—ด์ด๋ฉฐ, ๋‹ค์Œ์„ ๋งŒ์กฑํ•œ๋‹ค. \[2^{a_7}=2^{27} \cdot a_7.\] $a_2$์˜ ์ตœ์†Ÿ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
12
https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_9
0
Cities $A$ and $B$ are $45$ miles apart. Alicia lives in $A$ and Beth lives in $B$. Alicia bikes towards $B$ at 18 miles per hour. Leaving at the same time, Beth bikes toward $A$ at 12 miles per hour. How many miles from City $A$ will they be when they meet?
๋„์‹œ A์™€ B๋Š” 45๋งˆ์ผ ๋–จ์–ด์ ธ ์žˆ๋‹ค. Alicia๋Š” A์— ์‚ด๊ณ  Beth๋Š” B์— ์‚ฐ๋‹ค. Alicia๋Š” ์‹œ์† 18๋งˆ์ผ๋กœ B๋ฅผ ํ–ฅํ•ด ์ž์ „๊ฑฐ๋ฅผ ํƒ€๊ณ  ๊ฐ„๋‹ค. ๋™์‹œ์— Beth๋Š” ์‹œ์† 12๋งˆ์ผ๋กœ A๋ฅผ ํ–ฅํ•ด ์ž์ „๊ฑฐ๋ฅผ ํƒ€๊ณ  ๊ฐ„๋‹ค. ๊ทธ๋“ค์ด ๋งŒ๋‚  ๋•Œ ๋„์‹œ A์—์„œ ๋ช‡ ๋งˆ์ผ ๋–จ์–ด์ ธ ์žˆ๋Š”๊ฐ€?
27
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_1
1
Positive real numbers $x$ and $y$ satisfy $y^3=x^2$ and $(y-x)^2=4y^2$. What is $x+y$?
์–‘์˜ ์‹ค์ˆ˜ $x$์™€ $y$๋Š” $y^3=x^2$๊ณผ $(y-x)^2=4y^2$์„ ๋งŒ์กฑํ•œ๋‹ค. $x+y$๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
36
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_10
2
What is the degree measure of the acute angle formed by lines with slopes $2$ and $\frac{1}{3}$?
๊ธฐ์šธ๊ธฐ๊ฐ€ $2$ ์™€ $\frac{1}{3}$ ์ธ ๋‘ ์ง์„ ์ด ์ด๋ฃจ๋Š” ์˜ˆ๊ฐ์˜ ํฌ๊ธฐ๋Š” ๋ช‡ ๋„์ธ๊ฐ€?
45
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_11
3
What is the value of \[2^3 - 1^3 + 4^3 - 3^3 + 6^3 - 5^3 + \dots + 18^3 - 17^3?\]
๋‹ค์Œ ์‹์˜ ๊ฐ’์€ ๋ฌด์—‡์ธ๊ฐ€? \[2^3 - 1^3 + 4^3 - 3^3 + 6^3 - 5^3 + \dots + 18^3 - 17^3?\]
3,159
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_12
4
In a table tennis tournament every participant played every other participant exactly once. Although there were twice as many right-handed players as left-handed players, the number of games won by left-handed players was $40\%$ more than the number of games won by right-handed players. (There were no ties and no ambidextrous players.) What is the total number of games played?
ํƒ๊ตฌ ํ† ๋„ˆ๋จผํŠธ์—์„œ ๋ชจ๋“  ์ฐธ๊ฐ€์ž๋Š” ๋‹ค๋ฅธ ๋ชจ๋“  ์ฐธ๊ฐ€์ž์™€ ์ •ํ™•ํžˆ ํ•œ ๋ฒˆ์”ฉ ๊ฒฝ๊ธฐ๋ฅผ ํ–ˆ๋‹ค. ์˜ค๋ฅธ์†์žก์ด ์„ ์ˆ˜๊ฐ€ ์™ผ์†์žก์ด ์„ ์ˆ˜์˜ ๋‘ ๋ฐฐ์˜€์ง€๋งŒ, ์™ผ์†์žก์ด ์„ ์ˆ˜๊ฐ€ ์ด๊ธด ๊ฒฝ๊ธฐ ์ˆ˜๋Š” ์˜ค๋ฅธ์†์žก์ด ์„ ์ˆ˜๊ฐ€ ์ด๊ธด ๊ฒฝ๊ธฐ ์ˆ˜๋ณด๋‹ค $40\%$ ๋” ๋งŽ์•˜๋‹ค. (๋ฌด์Šน๋ถ€๋‚˜ ์–‘์†์žก์ด ์„ ์ˆ˜๋Š” ์—†์—ˆ๋‹ค.) ์ด ๊ฒฝ๊ธฐ ์ˆ˜๋Š” ๋ช‡ ๊ฒฝ๊ธฐ์˜€๋Š”๊ฐ€?
36
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_13
5
How many complex numbers satisfy the equation $z^5=\overline{z}$, where $\overline{z}$ is the conjugate of the complex number $z$?
๋ณต์†Œ์ˆ˜ $z$์˜ ์ผค๋ ˆ๋ณต์†Œ์ˆ˜๋ฅผ $\overline{z}$๋ผ๊ณ  ํ•  ๋•Œ, ๋ฐฉ์ •์‹ $z^5=\overline{z}$๋ฅผ ๋งŒ์กฑํ•˜๋Š” ๋ณต์†Œ์ˆ˜๋Š” ๋ช‡ ๊ฐœ์ธ๊ฐ€?
7
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_14
7
Consider the set of complex numbers $z$ satisfying $|1+z+z^{2}|=4$. The maximum value of the imaginary part of $z$ can be written in the form $\tfrac{\sqrt{m}}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
$|1+z+z^{2}|=4$๋ฅผ ๋งŒ์กฑํ•˜๋Š” ๋ณต์†Œ์ˆ˜ $z$์˜ ์ง‘ํ•ฉ์„ ์ƒ๊ฐํ•ด๋ณด์ž. $z$์˜ ํ—ˆ์ˆ˜ ๋ถ€๋ถ„์˜ ์ตœ๋Œ“๊ฐ’์€ $\tfrac{\sqrt{m}}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์—ฌ๊ธฐ์„œ $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์˜ ๊ฐ’์€ ๋ฌด์—‡์ธ๊ฐ€?
21
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_16
8
Flora the frog starts at 0 on the number line and makes a sequence of jumps to the right. In any one jump, independent of previous jumps, Flora leaps a positive integer distance $m$ with probability $\frac{1}{2^m}$. What is the probability that Flora will eventually land at 10? Write the answer as a simplified fraction $\frac{m}{n}$, find $m+n$
๊ฐœ๊ตฌ๋ฆฌ Flora๋Š” ์ˆ˜์ง์„ ์˜ 0์—์„œ ์‹œ์ž‘ํ•˜์—ฌ ์˜ค๋ฅธ์ชฝ์œผ๋กœ ์ ํ”„๋ฅผ ํ•œ๋‹ค. ๊ฐ ์ ํ”„์—์„œ, ์ด์ „ ์ ํ”„์™€ ๋…๋ฆฝ์ ์œผ๋กœ Flora๋Š” ์–‘์˜ ์ •์ˆ˜ ๊ฑฐ๋ฆฌ $m$์„ ํ™•๋ฅ  $\frac{1}{2^m}$์œผ๋กœ ์ ํ”„ํ•œ๋‹ค. Flora๊ฐ€ ๊ฒฐ๊ตญ 10์— ๋„์ฐฉํ•  ํ™•๋ฅ ์€ ์–ผ๋งˆ์ธ๊ฐ€? ๋‹ต์„ ๊ธฐ์•ฝ๋ถ„์ˆ˜ $\frac{m}{n}$์œผ๋กœ ์“ฐ๊ณ , $m+n$์„ ๊ตฌํ•˜์‹œ์˜ค.
3
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_17
10
What is the product of all solutions to the equation \[\log_{7x}2023\cdot \log_{289x}2023=\log_{2023x}2023\]
๋ฐฉ์ •์‹ \[\log_{7x}2023\cdot \log_{289x}2023=\log_{2023x}2023\] ์˜ ๋ชจ๋“  ํ•ด์˜ ๊ณฑ์€ ์–ผ๋งˆ์ธ๊ฐ€?
1
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_19
11
The weight of $\frac{1}{3}$ of a large pizza together with $3 \frac{1}{2}$ cups of orange slices is the same as the weight of $\frac{3}{4}$ of a large pizza together with $\frac{1}{2}$ cup of orange slices. A cup of orange slices weighs $\frac{1}{4}$ of a pound. What is the weight, in pounds, of a large pizza? The answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m-n$?
ํฐ ํ”ผ์ž $\frac{1}{3}$์˜ ๋ฌด๊ฒŒ์™€ ์˜ค๋ Œ์ง€ ์กฐ๊ฐ $3 \frac{1}{2}$ ์ปต์˜ ๋ฌด๊ฒŒ๋Š” ํฐ ํ”ผ์ž $\frac{3}{4}$์˜ ๋ฌด๊ฒŒ์™€ ์˜ค๋ Œ์ง€ ์กฐ๊ฐ $\frac{1}{2}$ ์ปต์˜ ๋ฌด๊ฒŒ์™€ ๊ฐ™๋‹ค. ์˜ค๋ Œ์ง€ ์กฐ๊ฐ ํ•œ ์ปต์˜ ๋ฌด๊ฒŒ๋Š” $\frac{1}{4}$ ํŒŒ์šด๋“œ์ด๋‹ค. ํฐ ํ”ผ์ž์˜ ๋ฌด๊ฒŒ๋Š” ํŒŒ์šด๋“œ ๋‹จ์œ„๋กœ ์–ผ๋งˆ์ธ๊ฐ€? ๋‹ต์€ $\frac{m}{n}$ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์—ฌ๊ธฐ์„œ $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m-n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
4
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_2
12
Rows 1, 2, 3, 4, and 5 of a triangular array of integers are shown below. 1 1 1 1 3 1 1 5 5 1 1 7 11 7 1 Each row after the first row is formed by placing a 1 at each end of the row, and each interior entry is 1 greater than the sum of the two numbers diagonally above it in the previous row. What is the units digits of the sum of the 2023 numbers in the 2023rd row?
์‚ผ๊ฐํ˜• ํ˜•ํƒœ์˜ ์ •์ˆ˜ ๋ฐฐ์—ด์˜ 1, 2, 3, 4, 5ํ–‰์ด ์•„๋ž˜์™€ ๊ฐ™์ด ํ‘œ์‹œ๋œ๋‹ค. 1 1 1 1 3 1 1 5 5 1 1 7 11 7 1 ์ฒซ ๋ฒˆ์งธ ํ–‰ ์ดํ›„์˜ ๊ฐ ํ–‰์€ ํ–‰์˜ ๊ฐ ๋์— 1์„ ๋ฐฐ์น˜ํ•˜๊ณ , ๊ฐ ๋‚ด๋ถ€ ํ•ญ๋ชฉ์€ ์ด์ „ ํ–‰์—์„œ ๋Œ€๊ฐ์„  ์œ„์— ์žˆ๋Š” ๋‘ ์ˆซ์ž์˜ ํ•ฉ๋ณด๋‹ค 1๋งŒํผ ํฌ๋‹ค. 2023๋ฒˆ์งธ ํ–‰์— ์žˆ๋Š” 2023๊ฐœ ์ˆซ์ž์˜ ํ•ฉ์˜ ์ผ์˜ ์ž๋ฆฟ์ˆ˜๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
5
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_20
13
If $A$ and $B$ are vertices of a polyhedron, define the distance $d(A,B)$ to be the minimum number of edges of the polyhedron one must traverse in order to connect $A$ and $B$. For example, if $\overline{AB}$ is an edge of the polyhedron, then $d(A, B) = 1$, but if $\overline{AC}$ and $\overline{CB}$ are edges and $\overline{AB}$ is not an edge, then $d(A, B) = 2$. Let $Q$, $R$, and $S$ be randomly chosen distinct vertices of a regular icosahedron (regular polyhedron made up of 20 equilateral triangles). Find the probability that $d(Q, R) > d(R, S)$. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
$A$์™€ $B$๊ฐ€ ๋‹ค๋ฉด์ฒด์˜ ๊ผญ์ง“์ ์ด๋ฉด, ๊ฑฐ๋ฆฌ $d(A,B)$๋ฅผ $A$์™€ $B$๋ฅผ ์—ฐ๊ฒฐํ•˜๊ธฐ ์œ„ํ•ด ๋‹ค๋ฉด์ฒด์˜ ๋ชจ์„œ๋ฆฌ๋ฅผ ๋”ฐ๋ผ ์ด๋™ํ•ด์•ผ ํ•˜๋Š” ์ตœ์†Œ ๊ฐœ์ˆ˜๋กœ ์ •์˜ํ•œ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, $\overline{AB}$๊ฐ€ ๋‹ค๋ฉด์ฒด์˜ ๋ชจ์„œ๋ฆฌ์ด๋ฉด $d(A, B) = 1$์ด์ง€๋งŒ, $\overline{AC}$์™€ $\overline{CB}$๊ฐ€ ๋ชจ์„œ๋ฆฌ์ด๊ณ  $\overline{AB}$๊ฐ€ ๋ชจ์„œ๋ฆฌ๊ฐ€ ์•„๋‹ˆ๋ฉด $d(A, B) = 2$์ด๋‹ค. $Q$, $R$, $S$๋ฅผ ์ •์ด์‹ญ๋ฉด์ฒด(์ •์‚ผ๊ฐํ˜• 20๊ฐœ๋กœ ์ด๋ฃจ์–ด์ง„ ์ •๋‹ค๋ฉด์ฒด)์˜ ์„œ๋กœ ๋‹ค๋ฅธ ๊ผญ์ง“์ ์—์„œ ๋ฌด์ž‘์œ„๋กœ ์„ ํƒํ–ˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜์ž. $d(Q, R) > d(R, S)$์ผ ํ™•๋ฅ ์„ ๊ตฌํ•˜์‹œ์˜ค. ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์—ฌ๊ธฐ์„œ $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
29
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_21
14
Let $f$ be the unique function defined on the positive integers such that \[\sum_{d\mid n}d\cdot f\left(\frac{n}{d}\right)=1\] for all positive integers $n$. What is $f(2023)$?
์–‘์˜ ์ •์ˆ˜์—์„œ ์ •์˜๋œ ์œ ์ผํ•œ ํ•จ์ˆ˜ $f$๊ฐ€ ๋ชจ๋“  ์–‘์˜ ์ •์ˆ˜ $n$์— ๋Œ€ํ•ด \[\sum_{d\mid n}d\cdot f\left(\frac{n}{d}\right)=1\] ์„ ๋งŒ์กฑํ•œ๋‹ค๊ณ  ํ•˜์ž. $f(2023)$์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
96
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_22
15
How many ordered pairs of positive real numbers $(a,b)$ satisfy the equation \[(1+2a)(2+2b)(2a+b) = 32ab?\]
์–‘์˜ ์‹ค์ˆ˜ ์ˆœ์„œ์Œ $(a,b)$ ์ค‘์—์„œ ๋ฐฉ์ •์‹ \[(1+2a)(2+2b)(2a+b) = 32ab\]๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์ˆœ์„œ์Œ์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€?
1
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_23
16
Let $K$ be the number of sequences $A_1$, $A_2$, $\dots$, $A_n$ such that $n$ is a positive integer less than or equal to $10$, each $A_i$ is a subset of $\{1, 2, 3, \dots, 10\}$, and $A_{i-1}$ is a subset of $A_i$ for each $i$ between $2$ and $n$, inclusive. For example, $\{\}$, $\{5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 6, 7, 9\}$ is one such sequence, with $n = 5$.What is the remainder when $K$ is divided by $10$?
$n$์€ $10$ ์ดํ•˜์˜ ์–‘์˜ ์ •์ˆ˜์ด๊ณ , ๊ฐ $A_i$๋Š” $\{1, 2, 3, \dots, 10\}$์˜ ๋ถ€๋ถ„์ง‘ํ•ฉ์ด๋ฉฐ, $2$ ์ด์ƒ $n$ ์ดํ•˜์˜ ๊ฐ $i$์— ๋Œ€ํ•ด $A_{i-1}$์€ $A_i$์˜ ๋ถ€๋ถ„์ง‘ํ•ฉ์ผ ๋•Œ, ์ˆ˜์—ด $A_1$, $A_2$, $\dots$, $A_n$์˜ ๊ฐœ์ˆ˜๋ฅผ $K$๋ผ๊ณ  ํ•˜์ž. ์˜ˆ๋ฅผ ๋“ค์–ด, $\{\}$, $\{5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 7\}$, $\{2, 5, 6, 7, 9\}$๋Š” $n = 5$์ธ ๊ฒฝ์šฐ์˜ ํ•œ ๊ฐ€์ง€ ์ˆ˜์—ด์ด๋‹ค. $K$๋ฅผ $10$์œผ๋กœ ๋‚˜๋ˆˆ ๋‚˜๋จธ์ง€๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
5
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_24
17
There is a unique sequence of integers $a_1, a_2, \cdots a_{2023}$ such that \[\tan2023x = \frac{a_1 \tan x + a_3 \tan^3 x + a_5 \tan^5 x + \cdots + a_{2023} \tan^{2023} x}{1 + a_2 \tan^2 x + a_4 \tan^4 x \cdots + a_{2022} \tan^{2022} x}\]whenever $\tan 2023x$ is defined. What is $a_{2023}?$
$\tan 2023x$๊ฐ€ ์ •์˜๋  ๋•Œ๋งˆ๋‹ค \[\tan2023x = \frac{a_1 \tan x + a_3 \tan^3 x + a_5 \tan^5 x + \cdots + a_{2023} \tan^{2023} x}{1 + a_2 \tan^2 x + a_4 \tan^4 x \cdots + a_{2022} \tan^{2022} x}\]๋ฅผ ๋งŒ์กฑํ•˜๋Š” ์œ ์ผํ•œ ์ •์ˆ˜ ์ˆ˜์—ด $a_1, a_2, \cdots a_{2023}$์ด ์กด์žฌํ•œ๋‹ค. $a_{2023}$์˜ ๊ฐ’์€ ์–ผ๋งˆ์ธ๊ฐ€?
-1
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_25
18
How many positive perfect squares less than $2023$ are divisible by $5$?
$2023$๋ณด๋‹ค ์ž‘์€ ์–‘์˜ ์™„์ „์ œ๊ณฑ์ˆ˜ ์ค‘์—์„œ $5$๋กœ ๋‚˜๋ˆ„์–ด๋–จ์–ด์ง€๋Š” ์ˆ˜๋Š” ๋ช‡ ๊ฐœ์ธ๊ฐ€?
8
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_3
19
How many digits are in the base-ten representation of $8^5 \cdot 5^{10} \cdot 15^5$?
$8^5 \cdot 5^{10} \cdot 15^5$์˜ 10์ง„๋ฒ• ํ‘œํ˜„์€ ๋ช‡ ์ž๋ฆฌ ์ˆซ์ž์ธ๊ฐ€?
18
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_4
20
Janet rolls a standard $6$-sided die $4$ times and keeps a running total of the numbers she rolls. What is the probability that at some point, her running total will equal $3$? The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
Janet์€ ํ‘œ์ค€ $6$-๋ฉด ์ฃผ์‚ฌ์œ„๋ฅผ $4$๋ฒˆ ๊ตด๋ฆฌ๊ณ  ๋‚˜์˜จ ์ˆซ์ž๋“ค์˜ ๋ˆ„์  ํ•ฉ๊ณ„๋ฅผ ๊ณ„์†ํ•ด์„œ ๊ณ„์‚ฐํ•œ๋‹ค. ์–ด๋Š ์‹œ์ ์—์„œ ๊ทธ๋…€์˜ ๋ˆ„์  ํ•ฉ๊ณ„๊ฐ€ $3$์ด ๋  ํ™•๋ฅ ์€ ์–ผ๋งˆ์ธ๊ฐ€? ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์—ฌ๊ธฐ์„œ $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
265
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_5
21
Points $A$ and $B$ lie on the graph of $y=\log_{2}x$. The midpoint of $\overline{AB}$ is $(6, 2)$. What is the positive difference between the $x$-coordinates of $A$ and $B$? The final answer can be written in the form $m \sqrt{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
์  $A$์™€ $B$๋Š” $y=\log_{2}x$ ๊ทธ๋ž˜ํ”„ ์œ„์— ์žˆ๋‹ค. $\overline{AB}$์˜ ์ค‘์ ์€ $(6, 2)$์ด๋‹ค. $A$์™€ $B$์˜ $x$-์ขŒํ‘œ ์‚ฌ์ด์˜ ์–‘์˜ ์ฐจ์ด๋Š” ์–ผ๋งˆ์ธ๊ฐ€? ์ตœ์ข… ๋‹ต์€ $m \sqrt{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์—ฌ๊ธฐ์„œ $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
9
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_6
22
A digital display shows the current date as an $8$-digit integer consisting of a $4$-digit year, followed by a $2$-digit month, followed by a $2$-digit date within the month. For example, Arbor Day this year is displayed as 20230428. For how many dates in $2023$ will each digit appear an even number of times in the 8-digital display for that date?
๋””์ง€ํ„ธ ๋””์Šคํ”Œ๋ ˆ์ด๋Š” ํ˜„์žฌ ๋‚ ์งœ๋ฅผ 4์ž๋ฆฌ ์—ฐ๋„, 2์ž๋ฆฌ ์›”, 2์ž๋ฆฌ ์ผ๋กœ ๊ตฌ์„ฑ๋œ 8์ž๋ฆฌ ์ •์ˆ˜๋กœ ํ‘œ์‹œํ•œ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, 2023๋…„ ์‹๋ชฉ์ผ์€ 20230405๋กœ ํ‘œ์‹œ๋œ๋‹ค. 2023๋…„์—๋Š” 8์ž๋ฆฌ ๋””์Šคํ”Œ๋ ˆ์ด์—์„œ ๊ฐ ์ˆซ์ž๊ฐ€ ์ง์ˆ˜ ๋ฒˆ ๋‚˜ํƒ€๋‚˜๋Š” ๋‚ ์งœ๊ฐ€ ๋ช‡ ๊ฐœ์ธ๊ฐ€?
9
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_7
23
Maureen is keeping track of the mean of her quiz scores this semester. If Maureen scores an $11$ on the next quiz, her mean will increase by $1$. If she scores an $11$ on each of the next three quizzes, her mean will increase by $2$. What is the mean of her quiz scores currently?
Maureen์€ ์ด๋ฒˆ ํ•™๊ธฐ ํ€ด์ฆˆ ์ ์ˆ˜์˜ ํ‰๊ท ์„ ๊ธฐ๋กํ•˜๊ณ  ์žˆ๋‹ค. Maureen์ด ๋‹ค์Œ ํ€ด์ฆˆ์—์„œ $11$์ ์„ ๋ฐ›์œผ๋ฉด ํ‰๊ท ์ด $1$๋งŒํผ ์ฆ๊ฐ€ํ•œ๋‹ค. ๋‹ค์Œ ์„ธ ๋ฒˆ์˜ ํ€ด์ฆˆ์—์„œ ๊ฐ๊ฐ $11$์ ์„ ๋ฐ›์œผ๋ฉด ํ‰๊ท ์ด $2$๋งŒํผ ์ฆ๊ฐ€ํ•œ๋‹ค. ํ˜„์žฌ ๊ทธ๋…€์˜ ํ€ด์ฆˆ ์ ์ˆ˜์˜ ํ‰๊ท ์€ ์–ผ๋งˆ์ธ๊ฐ€?
7
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12A_Problems/Problem_8
25
Mrs. Jones is pouring orange juice into four identical glasses for her four sons. She fills the first three glasses completely but runs out of juice when the fourth glass is only $\frac{1}{3}$ full. What fraction of a glass must Mrs. Jones pour from each of the first three glasses into the fourth glass so that all four glasses will have the same amount of juice? The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
Jones ๋ถ€์ธ์€ ๋„ค ์•„๋“ค์—๊ฒŒ ๋˜‘๊ฐ™์€ ๋„ค ๊ฐœ์˜ ์ž”์— ์˜ค๋ Œ์ง€ ์ฃผ์Šค๋ฅผ ๋”ฐ๋ฅด๊ณ  ์žˆ๋‹ค. ๊ทธ๋…€๋Š” ์ฒ˜์Œ ์„ธ ์ž”์„ ๊ฐ€๋“ ์ฑ„์› ์ง€๋งŒ ๋„ค ๋ฒˆ์งธ ์ž”์€ $\frac{1}{3}$๋งŒ ์ฑ„์›Œ์กŒ์„ ๋•Œ ์ฃผ์Šค๊ฐ€ ๋‹ค ๋–จ์–ด์กŒ๋‹ค. ๋„ค ์ž”์˜ ์ฃผ์Šค ์–‘์„ ๋˜‘๊ฐ™์ด ๋งŒ๋“ค๊ธฐ ์œ„ํ•ด ์กด์Šค ๋ถ€์ธ์€ ์ฒ˜์Œ ์„ธ ์ž”์—์„œ ๋„ค ๋ฒˆ์งธ ์ž”์œผ๋กœ ๊ฐ๊ฐ ์–ผ๋งˆ๋งŒํผ์˜ ์ฃผ์Šค๋ฅผ ๋”ฐ๋ผ์•ผ ํ•˜๋Š”๊ฐ€? ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
7
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_1
26
In the $xy$-plane, a circle of radius $4$ with center on the positive $x$-axis is tangent to the $y$-axis at the origin, and a circle with radius $10$ with center on the positive $y$-axis is tangent to the $x$-axis at the origin. What is the slope of the line passing through the two points at which these circles intersect? The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
$xy$-ํ‰๋ฉด์—์„œ, ์–‘์˜ $x$-์ถ• ์œ„์— ์ค‘์‹ฌ์ด ์žˆ๊ณ  ๋ฐ˜์ง€๋ฆ„์ด $4$์ธ ์›์ด ์›์ ์—์„œ $y$-์ถ•์— ์ ‘ํ•˜๊ณ , ์–‘์˜ $y$-์ถ• ์œ„์— ์ค‘์‹ฌ์ด ์žˆ๊ณ  ๋ฐ˜์ง€๋ฆ„์ด $10$์ธ ์›์ด ์›์ ์—์„œ $x$-์ถ•์— ์ ‘ํ•œ๋‹ค. ์ด ๋‘ ์›์ด ๊ต์ฐจํ•˜๋Š” ๋‘ ์ ์„ ์ง€๋‚˜๋Š” ์ง์„ ์˜ ๊ธฐ์šธ๊ธฐ๋Š” ์–ผ๋งˆ์ธ๊ฐ€? ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
7
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_10
27
Calculate the maximum area of an isosceles trapezoid that has legs of length $1$ and one base twice as long as the other. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m^2+n^2$?
ํ‰ํ–‰ํ•˜์ง€ ์•Š์€ ํ•œ ์Œ์˜ ๋Œ€๋ณ€์˜ ๊ธธ์ด๊ฐ€ $1$์ด๊ณ  ํ•œ ๋ฐ‘๋ณ€์˜ ๊ธธ์ด๊ฐ€ ๋‹ค๋ฅธ ๋ฐ‘๋ณ€ ๊ธธ์ด์˜ ๋‘ ๋ฐฐ์ธ ๋“ฑ๋ณ€์‚ฌ๋‹ค๋ฆฌ๊ผด์˜ ์ตœ๋Œ€ ๋„“์ด๋ฅผ ๊ตฌํ•˜์‹œ์˜ค. ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m^2+n^2$์€ ์–ผ๋งˆ์ธ๊ฐ€?
13
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_11
28
For complex number $u = a+bi$ and $v = c+di$ (where $i=\sqrt{-1}$), define the binary operation $u \otimes v = ac + bdi$ Suppose $z$ is a complex number such that $z\otimes z = z^{2}+40$. What is $|z|^2$?
๋ณต์†Œ์ˆ˜ $u = a+bi$ ์™€ $v = c+di$ (๋‹จ, $i=\sqrt{-1}$)์— ๋Œ€ํ•ด, ์ดํ•ญ ์—ฐ์‚ฐ์„ ๋‹ค์Œ๊ณผ ๊ฐ™์ด ์ •์˜ํ•œ๋‹ค. $u \otimes v = ac + bdi$ $z\otimes z = z^{2}+40$์„ ๋งŒ์กฑํ•˜๋Š” ๋ณต์†Œ์ˆ˜ $z$๊ฐ€ ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜์ž. $|z|^2$์€ ์–ผ๋งˆ์ธ๊ฐ€?
50
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_12
29
A rectangular box $P$ has distinct edge lengths $a$, $b$, and $c$. The sum of the lengths of all $12$ edges of $P$ is $13$, the areas of all $6$ faces of $P$ is $\frac{11}{2}$, and the volume of $P$ is $\frac{1}{2}$. Find the length of the longest interior diagonal connecting two vertices of $P$. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
์ง์œก๋ฉด์ฒด $P$๋Š” ์„œ๋กœ ๋‹ค๋ฅธ ๋ชจ์„œ๋ฆฌ ๊ธธ์ด $a$, $b$, $c$๋ฅผ ๊ฐ–๋Š”๋‹ค. $P$์˜ ๋ชจ๋“  $12$๊ฐœ ๋ชจ์„œ๋ฆฌ ๊ธธ์ด์˜ ํ•ฉ์€ $13$์ด๊ณ , $P$์˜ ๋ชจ๋“  $6$๊ฐœ ๋ฉด์˜ ๋„“์ด์˜ ํ•ฉ์€ $\frac{11}{2}$์ด๋ฉฐ, $P$์˜ ๋ถ€ํ”ผ๋Š” $\frac{1}{2}$์ด๋‹ค. $P$์˜ ๋‘ ๊ผญ์ง“์ ์„ ์—ฐ๊ฒฐํ•˜๋Š” ๊ฐ€์žฅ ๊ธด ๋‚ด๋ถ€ ๋Œ€๊ฐ์„ ์˜ ๊ธธ์ด๋ฅผ ๊ตฌํ•˜์‹œ์˜ค. ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
13
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_13
30
For how many ordered pairs $(a,b)$ of integers does the polynomial $x^3+ax^2+bx+6$ have $3$ distinct integer roots?
์ •์ˆ˜๋“ค์˜ ์ˆœ์„œ์Œ $(a,b)$ ์ค‘ ๋‹คํ•ญ์‹ $x^3+ax^2+bx+6$ ์ด ์„œ๋กœ ๋‹ค๋ฅธ 3๊ฐœ์˜ ์ •์ˆ˜ ๊ทผ์„ ๊ฐ–๋Š” ๊ฒฝ์šฐ๋Š” ๋ช‡ ๊ฐœ์ธ๊ฐ€?
5
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_14
32
In the state of Coinland, coins have values $6,10,$ and $15$ cents. Suppose $x$ is the value in cents of the most expensive item in Coinland that cannot be purchased using these coins with exact change. What is the sum of the digits of $x?$
Coinland๋ผ๋Š” ๋‚˜๋ผ์—์„œ๋Š” ๋™์ „์˜ ๊ฐ€์น˜๊ฐ€ $6, 10, 15$ ์„ผํŠธ์ด๋‹ค. $x$ ๋ฅผ ์ด ๋™์ „๋“ค์„ ์‚ฌ์šฉํ•˜์—ฌ ๊ฑฐ์Šค๋ฆ„๋ˆ ์—†์ด ๊ตฌ๋งคํ•  ์ˆ˜ ์—†๋Š” Coinland์—์„œ ๊ฐ€์žฅ ๋น„์‹ผ ๋ฌผ๊ฑด์˜ ๊ฐ€๊ฒฉ(์„ผํŠธ ๋‹จ์œ„)์ด๋ผ๊ณ  ๊ฐ€์ •ํ•˜์ž. $x$ ์˜ ๊ฐ ์ž๋ฆฟ์ˆ˜์˜ ํ•ฉ์€ ์–ผ๋งˆ์ธ๊ฐ€?
11
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_16
33
Triangle $ABC$ has side lengths in arithmetic progression, and the smallest side has length $6.$ If the triangle has an angle of $120^\circ,$ Find the area of $ABC$. The final answer can be simplified in the form $m \sqrt{n}$, where $m$ and $n$ are positive integers and $n$ without square factore. What is $m+n$?
์‚ผ๊ฐํ˜• $ABC$ ์˜ ๋ณ€์˜ ๊ธธ์ด๊ฐ€ ๋“ฑ์ฐจ์ˆ˜์—ด์„ ์ด๋ฃจ๊ณ  ๊ฐ€์žฅ ์งง์€ ๋ณ€์˜ ๊ธธ์ด๊ฐ€ $6$์ด๋‹ค. ์‚ผ๊ฐํ˜•์˜ ํ•œ ๊ฐ์ด $120^\circ$ ๋ผ๋ฉด, $ABC$ ์˜ ๋„“์ด๋ฅผ ๊ตฌํ•˜์‹œ์˜ค. ์ตœ์ข… ๋‹ต์€ $m \sqrt{n}$ ํ˜•ํƒœ๋กœ ๊ฐ„์†Œํ™”ํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, $m$ ๊ณผ $n$ ์€ ์–‘์˜ ์ •์ˆ˜์ด๊ณ  $n$ ์€ ์ œ๊ณฑ ์ธ์ˆ˜๊ฐ€ ์—†๋‹ค. $m+n$ ์€ ์–ผ๋งˆ์ธ๊ฐ€?
18
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_17
36
Carlos went to a sports store to buy running shoes. Running shoes were on sale, with prices reduced by $20\%$ on every pair of shoes. Carlos also knew that he had to pay a $7.5\%$ sales tax on the discounted price. He had $$43$ dollars. What is the original (before discount) price of the most expensive shoes he could afford to buy?
Carlos๋Š” ์šด๋™ํ™”๋ฅผ ์‚ฌ๋Ÿฌ ์Šคํฌ์ธ  ์šฉํ’ˆ์ ์— ๊ฐ”๋‹ค. ์šด๋™ํ™”๋Š” ๋ชจ๋“  ์ผค๋ ˆ์— ๋Œ€ํ•ด $20\%$ ํ• ์ธ๋œ ๊ฐ€๊ฒฉ์œผ๋กœ ํŒ๋งค๋˜๊ณ  ์žˆ์—ˆ๋‹ค. Carlos๋Š” ๋˜ํ•œ ํ• ์ธ๋œ ๊ฐ€๊ฒฉ์— $7.5\%$ ์˜ ํŒ๋งค์„ธ๋ฅผ ์ง€๋ถˆํ•ด์•ผ ํ•œ๋‹ค๋Š” ๊ฒƒ์„ ์•Œ๊ณ  ์žˆ์—ˆ๋‹ค. ๊ทธ๋Š” $$43$ ๋‹ฌ๋Ÿฌ๋ฅผ ๊ฐ€์ง€๊ณ  ์žˆ์—ˆ๋‹ค. ๊ทธ๊ฐ€ ์‚ด ์ˆ˜ ์žˆ๋Š” ๊ฐ€์žฅ ๋น„์‹ผ ์‹ ๋ฐœ์˜ ์›๋ž˜ ๊ฐ€๊ฒฉ(ํ• ์ธ ์ „)์€ ์–ผ๋งˆ์ธ๊ฐ€?
50
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_2
40
When $n$ standard six-sided dice are rolled, the product of the numbers rolled can be any of $936$ possible values. What is $n$?
ํ‘œ์ค€ 6๋ฉด์ฒด ์ฃผ์‚ฌ์œ„ $n$ ๊ฐœ๋ฅผ ๋˜์งˆ ๋•Œ, ๋‚˜์˜จ ์ˆซ์ž๋“ค์˜ ๊ณฑ์€ $936$ ๊ฐœ์˜ ๊ฐ€๋Šฅํ•œ ๊ฐ’ ์ค‘ ํ•˜๋‚˜๊ฐ€ ๋  ์ˆ˜ ์žˆ๋‹ค. $n$์€ ์–ผ๋งˆ์ธ๊ฐ€?
11
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_23
41
Suppose that $a$, $b$, $c$ and $d$ are positive integers satisfying all of the following relations. \[abcd=2^6\cdot 3^9\cdot 5^7\] \[\text{lcm}(a,b)=2^3\cdot 3^2\cdot 5^3\] \[\text{lcm}(a,c)=2^3\cdot 3^3\cdot 5^3\] \[\text{lcm}(a,d)=2^3\cdot 3^3\cdot 5^3\] \[\text{lcm}(b,c)=2^1\cdot 3^3\cdot 5^2\] \[\text{lcm}(b,d)=2^2\cdot 3^3\cdot 5^2\] \[\text{lcm}(c,d)=2^2\cdot 3^3\cdot 5^2\] What is $\text{gcd}(a,b,c,d)$?
$a$, $b$, $c$, $d$๊ฐ€ ๋‹ค์Œ ๊ด€๊ณ„์‹์„ ๋ชจ๋‘ ๋งŒ์กฑํ•˜๋Š” ์–‘์˜ ์ •์ˆ˜๋ผ๊ณ  ๊ฐ€์ •ํ•˜์ž. \[abcd=2^6\cdot 3^9\cdot 5^7\] \[\text{lcm}(a,b)=2^3\cdot 3^2\cdot 5^3\] \[\text{lcm}(a,c)=2^3\cdot 3^3\cdot 5^3\] \[\text{lcm}(a,d)=2^3\cdot 3^3\cdot 5^3\] \[\text{lcm}(b,c)=2^1\cdot 3^3\cdot 5^2\] \[\text{lcm}(b,d)=2^2\cdot 3^3\cdot 5^2\] \[\text{lcm}(c,d)=2^2\cdot 3^3\cdot 5^2\] $\text{gcd}(a,b,c,d)$๋Š” ๋ฌด์—‡์ธ๊ฐ€?
3
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_24
43
A $3-4-5$ right triangle is inscribed in circle $A$, and a $5-12-13$ right triangle is inscribed in circle $B$. Find the ratio of the area of circle $A$ to the area of circle $B$. The final answer can be written in the form $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$?
$3-4-5$ ์ง๊ฐ ์‚ผ๊ฐํ˜•์ด ์› $A$์— ๋‚ด์ ‘ํ•˜๊ณ , $5-12-13$ ์ง๊ฐ ์‚ผ๊ฐํ˜•์ด ์› $B$์— ๋‚ด์ ‘ํ•œ๋‹ค. ์› $A$์˜ ๋„“์ด์™€ ์› $B$์˜ ๋„“์ด์˜ ๋น„์œจ์„ ๊ตฌํ•˜์‹œ์˜ค. ์ตœ์ข… ๋‹ต์€ $\frac{m}{n}$์˜ ํ˜•ํƒœ๋กœ ์“ธ ์ˆ˜ ์žˆ์œผ๋ฉฐ, $m$๊ณผ $n$์€ ์„œ๋กœ์†Œ์ธ ์–‘์˜ ์ •์ˆ˜์ด๋‹ค. $m+n$์€ ๋ฌด์—‡์ธ๊ฐ€?
194
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_3
44
Jackson's paintbrush makes a narrow strip with a width of $6.5$ millimeters. Jackson has enough paint to make a strip $25$ meters long. How many square centimeters of paper could Jackson cover with paint?
Jackson์˜ ๋ถ“์€ ๋„ˆ๋น„๊ฐ€ $6.5$ ๋ฐ€๋ฆฌ๋ฏธํ„ฐ์ธ ์ข์€ ๋ ๋ฅผ ๋งŒ๋“ ๋‹ค. Jackson์€ $25$ ๋ฏธํ„ฐ ๊ธธ์ด์˜ ๋ ๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š” ์ถฉ๋ถ„ํ•œ ํŽ˜์ธํŠธ๋ฅผ ๊ฐ€์ง€๊ณ  ์žˆ๋‹ค. Jackson์€ ๋ช‡ ์ œ๊ณฑ์„ผํ‹ฐ๋ฏธํ„ฐ์˜ ์ข…์ด๋ฅผ ํŽ˜์ธํŠธ๋กœ ๋ฎ์„ ์ˆ˜ ์žˆ๋Š”๊ฐ€?
1,625
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_4
45
You are playing a game. A $2 \times 1$ rectangle covers two adjacent squares (oriented either horizontally or vertically) of a $3 \times 3$ grid of squares, but you are not told which two squares are covered. Your goal is to find at least one square that is covered by the rectangle. A "turn" consists of you guessing a square, after which you are told whether that square is covered by the hidden rectangle. What is the minimum number of turns you need to ensure that at least one of your guessed squares is covered by the rectangle?
๋‹น์‹ ์€ ๊ฒŒ์ž„์„ ํ•˜๊ณ  ์žˆ๋‹ค. $2 \times 1$ ์ง์‚ฌ๊ฐํ˜•์€ $3 \times 3$ ๊ฒฉ์ž์˜ ์ธ์ ‘ํ•œ ๋‘ ์ •์‚ฌ๊ฐํ˜•(๊ฐ€๋กœ ๋˜๋Š” ์„ธ๋กœ ๋ฐฉํ–ฅ)์„ ๋ฎ์ง€๋งŒ ์–ด๋–ค ๋‘ ์ •์‚ฌ๊ฐํ˜•์ด ๋ฎ์—ฌ ์žˆ๋Š”์ง€๋Š” ์•Œ๋ ค์ฃผ์ง€ ์•Š๋Š”๋‹ค. ๋‹น์‹ ์˜ ๋ชฉํ‘œ๋Š” ์ง์‚ฌ๊ฐํ˜•์œผ๋กœ ๋ฎ์ธ ์ •์‚ฌ๊ฐํ˜•์„ ์ ์–ด๋„ ํ•˜๋‚˜ ์ฐพ๋Š” ๊ฒƒ์ด๋‹ค. ํ•œ "ํ„ด"์€ ๋‹น์‹ ์ด ์ •์‚ฌ๊ฐํ˜•์„ ์ถ”์ธกํ•˜๋Š” ๊ฒƒ์œผ๋กœ ๊ตฌ์„ฑ๋˜๋ฉฐ, ๊ทธ ํ›„์— ๋‹น์‹ ์€ ๊ทธ ์ •์‚ฌ๊ฐํ˜•์ด ์ˆจ๊ฒจ์ง„ ์ง์‚ฌ๊ฐํ˜•์œผ๋กœ ๋ฎ์—ฌ ์žˆ๋Š”์ง€ ์—ฌ๋ถ€๋ฅผ ์•Œ๊ฒŒ ๋œ๋‹ค. ์ถ”์ธกํ•œ ์ •์‚ฌ๊ฐํ˜•๋“ค ์ค‘ ์ ์–ด๋„ ํ•˜๋‚˜๊ฐ€ ์ง์‚ฌ๊ฐํ˜•์œผ๋กœ ๋ฎ์—ฌ ์žˆ๋„๋ก ํ•˜๋ ค๋ฉด ์ตœ์†Œ ๋ช‡ ํ„ด์ด ํ•„์š”ํ•œ๊ฐ€?
4
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_5
46
When the roots of the polynomial \[P(x) = (x-1)^1 (x-2)^2 (x-3)^3 \cdot \cdot \cdot (x-10)^{10}\] are removed from the number line, what remains is the union of $11$ disjoint open intervals. On how many of these intervals is $P(x)$ positive?
๋‹คํ•ญ์‹ \[P(x) = (x-1)^1 (x-2)^2 (x-3)^3 \cdot \cdot \cdot (x-10)^{10}\] ์˜ ๊ทผ์„ ์ˆ˜์ง์„ ์—์„œ ์ œ๊ฑฐํ•˜๋ฉด, ๋‚จ์€ ๊ฒƒ์€ 11๊ฐœ์˜ ์„œ๋กœ์†Œ์ธ ์—ด๋ฆฐ ๊ตฌ๊ฐ„์˜ ํ•ฉ์ง‘ํ•ฉ์ด๋‹ค. ์ด๋Ÿฌํ•œ ๊ตฌ๊ฐ„ ์ค‘ ๋ช‡ ๊ฐœ์—์„œ $P(x)$๊ฐ€ ์–‘์ˆ˜์ธ๊ฐ€?
6
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_6
47
For how many integers $n$ does the expression\[\sqrt{\frac{\log (n^2) - (\log n)^2}{\log n - 3}}\]represent a real number, where log denotes the base $10$ logarithm?
์‹ \[\sqrt{\frac{\log (n^2) - (\log n)^2}{\log n - 3}}\]์ด ์‹ค์ˆ˜๊ฐ€ ๋˜๋Š” ์ •์ˆ˜ $n$์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€? ์—ฌ๊ธฐ์„œ log๋Š” ๋ฐ‘์ด $10$์ธ ๋กœ๊ทธ๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค.
901
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_7
48
How many nonempty subsets $B$ of ${0, 1, 2, 3, \cdots, 12}$ have the property that the number of elements in $B$ is equal to the least element of $B$? For example, $B = {4, 6, 8, 11}$ satisfies the condition.
${0, 1, 2, 3, \cdots, 12}$์˜ ๊ณต์ง‘ํ•ฉ์ด ์•„๋‹Œ ๋ถ€๋ถ„์ง‘ํ•ฉ $B$ ์ค‘์—์„œ, $B$์˜ ์›์†Œ ๊ฐœ์ˆ˜๊ฐ€ $B$์˜ ์ตœ์†Œ ์›์†Œ์™€ ๊ฐ™์€ ๋ถ€๋ถ„์ง‘ํ•ฉ์€ ๋ช‡ ๊ฐœ์ธ๊ฐ€? ์˜ˆ๋ฅผ ๋“ค์–ด, $B = {4, 6, 8, 11}$์€ ์กฐ๊ฑด์„ ๋งŒ์กฑํ•œ๋‹ค.
144
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_8
49
What is the area of the region in the coordinate plane defined by $| | x | - 1 | + | | y | - 1 | \le 1$?
์ขŒํ‘œํ‰๋ฉด์—์„œ $| | x | - 1 | + | | y | - 1 | \le 1$์œผ๋กœ ์ •์˜๋œ ์˜์—ญ์˜ ๋„“์ด๋Š” ์–ผ๋งˆ์ธ๊ฐ€?
8
https://artofproblemsolving.com/wiki/index.php/2023_AMC_12B_Problems/Problem_9