2b3+5=2(3)3 +5 SOMEONE HELP

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?

Which of the following can be used to explain a statement in a geometric proof?

Write a similarity statement for the similar triangles. afgh ~ a