text: any math majors out there? ive done most of my final except 2 problems i just can't get. they both deal with probability.   1)a group is composed by choosing 6 people from 5 boys and 4 girls. what is the probability that the group will have 3 girls?  2)a ball is drawn from a bag containing 13 red balls numbered 1-13, and 5 white balls numbered 14-18. what is the probability that  a) the ball is not even-numbered? b)the ball is red and even-numbered? c)the ball is red or even-numbered? d)the ball is niether red nor even-numbered?  any help would be appreciated. thx 1) 90% cuz most people rather have girls in the group... 2a)there's 9 odd balls out of 18 so its 50/50  b)there's 6 red evens so it's 33.333% probability almost  c)that includes 6 red and 3 white evens... 9 out of 18= 50%  d)opposite of previous is oops trick ? only 2 white oddballs... odds are 1/9= like about 11%