A professor has learned that three students in her class of


Question: A professor has learned that three students in her class of 20 will cheat on the exam . She decides to focus her attention on four randomly chosen students during the exam.

a. What is the probability that she finds at least o n e of the students cheating?

b. What is the probability that she finds at least o n e of the students cheating if she focuses on six randomly chosen students?

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