There are four urns, which we label A, B, C, and D, and each of
these urns contains some white balls and some black balls, as
specified below.•UrnAhas3white balls and2black balls•UrnBhas2white
balls and6black balls•UrnChas3white balls and6black
balls•UrnDhas5white balls and7black balls one of the urns is chosen
at random, and then one of the balls is selected from the chosen
urn.
(a) What is the probability that urnAis chosen, and then a white
ball is chosen from thaturn?
(b) What is...