Bradley is at the bird exhibit in the zoo. he would like to visit the reptile exhibit. which path can bradley use to get to the reptile exhibit from the bird exhibit?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?