MATH
posted by Jon .
Urn A contains six white balls and three black balls. Urn B contains seven white balls and five black balls. A ball is drawn from Urn A and then transferred to Urn B. A ball is then drawn from Urn B. What is the probability that the transferred ball was white given that the second ball drawn was white? (Round your answer to three decimal places.)

determine the probability of selecting 2 red marbles. selecting
a box contain 7 black ,3 red, and 5 purple marbles consider the two stage experiment of randomly selecting a marble from the box