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A professor gives his students 9 essay questions to prepare for an exam. Only 2 of the questions will actually appear on the exam. How many different exams are possible?
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A professor gives his students 9 essay questions to prepare for an exam. Only 2 of the questions will actually appear on the exam. How many different exams are possible?

User Seasong
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Answer:

There are 36 possible exams.

Explanation:

How many ways can you select 2 questions out of 9? 9 choose 2.


(9!)/(2!7!)= 36

User Daphnee
by
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