Question

What is the probability that both balls are white?

Answer 1

1/11

Explanation:

We have 3 white balls in the first urn out of 9. That means we have a 1 in 3 chance at picking the white ball in the first urn.

Now we have a 3 in 11 chance at picking the white ball in the second urn.

1/3 × 3/11 = 1/11 chance