jamiecoolgal1923 jamiecoolgal1923

23-01-2020
Mathematics

contestada

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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fahadisahadam fahadisahadam

23-01-2020

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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