# You can answer any 10 questions from a total of 12 questions on an exam. In how many different ways can you select the questions?

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Noah G
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Feb 9, 2018

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Because order doesn't matter in this problem, we use the combination formula.

We are picking

#color(white)("two")_nC_r = (n!)/((n - r)!r!) = (12!)/((12 - 10)!10!) = 66#

Hence, there are

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