Suppose that in a large lot containing T manufactured items, 30 percent of the items are defective

Question:

Suppose that in a large lot containing T manufactured items, 30 percent of the items are defective and 70 percent are nondefective. Also, suppose that ten items are selected at random without replacement from the lot. Determine
(a) An exact expression for the probability that not more than one defective item will be obtained
(b) An approximate expression for this probability based on the binomial distribution.