Chips suppose a computer chip manufacturer rejects 2% of the chips produced because they fail presale testing. a. what's the probability that the fifth chip you test is the rst bad one you nd? b. what's the probability you nd a bad one within the rst 10 you examine?

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?