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in a class of 20 students, what is the probability the professor will catch two students...

in a class of 20 students, what is the probability the professor will catch two students plagiarized if the professor only checked 15 research papers, 6 of whom have plagiarized material

Math   Statistics-And-Probability   
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Answer #1

Answer is 0.3456.

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Please go through them carefully specially the notations.

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