69. An interviewer is given a list of potential people she can interview. If the interviewer needs to interview 5 people and if each person (independently) agrees to be interviewed with probability, what is the probability that her list of potential people will enable her to obtain her necessary number of interviews if the list consists of

(a) 5 people and

(b) 8 people? For part

(b) what is the probability that the interviewer will speak to exactly

(c) 6 people and

(d) 7 people on the list?