### Instruction: What is the least number of digits (including repetitions) needed to express 10^300 in decimal notation?
Answer Choices: (A) a)  4 (B) b)  100 (C) c)  301 (D) d)  1000 (E) e)  1001.### Response: Let's think about the multi-choice question step by step.
10^n is a decimal number with a 1 followed by n zeros.
So 10^300 will include 300 0's + 1 digit for 1 = 301
So The answer is C.