(a) If 4 balls are drawn in this way, what is the probability that exactly 2 are white? (b) If 4 balls are drawn without replacement, what is the probability that exactly 2 are white?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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3. A ball is drawn from an urn containing 3 white and 3 black balls. After the ball is drawn, it is replaced
and another ball is drawn. (a) If 4 balls are drawn in this way, what is the probability that exactly 2 are
white? (b) If 4 balls are drawn without replacement, what is the probability that exactly 2 are white?

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