Two urns contain white balls and yellow balls. The first urn contains 2 white balls and 7 yellow balls and the second um contains 3 white and 10 yellow. A ball is drawn at random from each urn. What is the probability that both balls are white?

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Answer 1 · 2016-08-29T23:09:20

#P(W;W) =2/39#

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 3/13#

=#2/cancel9^3 xx cancel3/13 = 2/39#