Two urns contain white balls and yellow balls. The first urn contains 2 white balls and 7 yellow balls and the second urn contains 10 white balls and 4 yellow balls. A ball is drawn at random from each urn. What is the probability that both balls are w?

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2/21
10/63
12/23
1/20

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Answer 1 · 2017-04-13T23:27:16

The first must be white and the second must be white.

#P(W,W) = P(W) xx P(W)#

#P(W,W) = 2/9 xx 10/14#

#P(W,W)=10/63#