Out of 15 computer chips, 7 are defective. Answer the following. You may give your answers as numerical expressions. You do not need to simplify your answers. A- In how many ways can 4 chips be chosen randomly without replacement from these 15 computer chips? B- In how many ways can 4 chips be chosen randomly with replacement from the defective part of these 15 computer chips? A C- If 5 chips are randomly chosen without replacement for testing, compute the probability that 2 of them are defective