SOLUTION: A cookie jar contains 12 oat meal cookies and 9 chocolate chip cookies. If 3 cookies are selected at random, what is the probability that at least one of the cookies is an oat meal

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: A cookie jar contains 12 oat meal cookies and 9 chocolate chip cookies. If 3 cookies are selected at random, what is the probability that at least one of the cookies is an oat meal      Log On


   

Question 851172: A cookie jar contains 12 oat meal cookies and 9 chocolate chip cookies. If 3 cookies are selected at random, what is the probability that at least one of the cookies is an oat meal cookie.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

21 cookies: 12 oat meal and 9 chocolate chip 

3 cookies are selected at random

P(at least one is oatmeal) = 1 -P(no oatmeal) = 1 -  %289%2F21%29%288%2F20%29%287%2F19%29