Name a pair of alternate interior angles 1. angle 3 and 4 2.angle 1 and angle 6 3. angle 3 and 6 4.angle 5 and 6

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?