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A drawer contains 3 white balls and 6 black balls. Two balls are drawn out of the box at random. What is the probability that they both are black?

 Nov 8, 2020
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there are 9 balls total in the drawer

the probability that the first one is black is 6/9=2/3

the probability that the second is black (with the first one drawn being black also) is (6-1)/(9-1)=5/8

multiply the probabilities:

(2/3)*(5/8)=10/24=5/12

 Nov 8, 2020

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