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45. a. You take a five-question multiple-choice quiz. You guess on all of the
questions, selecting one of five answers randomly each time. What is the
probability you will get a perfect score?
b. What is the probability that you would get a perfect score if there were six
questions on the quiz?
c. Find the ratio of P(perfect score on five-question quiz) to P(perfect score on
six-question quiz).