# 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

2/21

10/63

12/23

1/20

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Konstantinos Michailidis
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Apr 13, 2017

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

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