8. (20 pts) A batch of 60 semiconductor chips is inspected by choosing samples of 6 chips. Assume 9 of the chips do not conform to customer requirements. (a) How

many different samples of 6 chips are possible? (b) How many different samples of 6 chips contain exactly two nonconforming chips? (c) What is the probability that a sample of 6 chips contains exactly two nonconforming chips? (extra 5pts)