There are 5 x 10^3 workers in the shop, and each worker can fill 6.2 crates with fruit everyday. What is the total number of crates filled by the workers each day?

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?