# 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?

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

$P \left(W , W\right) = P \left(W\right) \times P \left(W\right)$
$P \left(W , W\right) = \frac{2}{9} \times \frac{10}{14}$
$P \left(W , W\right) = \frac{10}{63}$