Question

2. CHEATING ON AN EXAM

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) Find the probability that she finds at least one of the students cheating if she focuses on four

randomly chosen students?

b) Find the probability that she finds at least one of the students cheating if she focuses on six

randomly chosen students?

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