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27 February, 12:57

A professor gives his students 9 essay questions to prepare for an exam. Only 3 of the questions will actually appear on the exam. How many different exams are possible?

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  1. 27 February, 13:13
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    Answer: 84

    Step-by-step explanation:

    The total number of the questions is 9

    Possible question is 3

    This is combination

    Therefore n=9 and r=3

    Combination formula=n! / ((n-r) ! r!)

    9C3=9! / ((9-3) ! 3!)

    =362880 / (6! 3!)

    =362880/4320

    =84
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