SOLUTION: A student is asked to answer 7 out of 9 questions on an exam,in how many ways can she select the questions to be answered

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Question 612577: A student is asked to answer 7 out of 9 questions on an exam,in how many ways can she select the questions to be answered
Answer by solver91311(24713) About Me  (Show Source):
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You want 9 choose 7:



Where is the number of combinations of things taken at a time and is calculated by

IF the order in which she answers the questions does not matter. If it does matter, then take out of the denominator.

John

My calculator said it, I believe it, that settles it
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