Homework Help: math

Posted by sharon on Monday, February 13, 2012 at 6:34am.

6. A bowl contains 10 red balls, 10 green balls and 10 white balls. a. What is the probability of drawing 2 white balls with replacement? b. What is the probability of drawing 2 white balls without replacement?

math - Reiny, Monday, February 13, 2012 at 8:09am
when balls are replaced
Prob(2white) = (10/30)(10/30) = 1/9

without replacement
prob(2white) = (10/30)(9/29) = 3/29

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