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OpenStudy (anonymous):
How many ways are there to choose a committee of 3 people from a group of 9 people? 360 126 84 39
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OpenStudy (anonymous):
9C3 = 84
OpenStudy (anonymous):
I have one last one: Find the number of ways to purchase 5 different kinds of drinks from a selection of 13 drinks.
OpenStudy (anonymous):
13C5 = 1287
OpenStudy (anonymous):
i.e. the format of nCr is n!/r!(n-r)!
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