To find the probability that both balls are white you will find the probability of getting a while ball from each situation separately and then multiply these probabilities together.
1. 7/14 or 1/2 chance 2. 3/9 or 1/3 change
1/2 x 1/3 = 1/6
You will have a 1 in 6 chance of getting a white ball from both urns.
