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OpenStudy (anonymous):
How do I solve this problem: How many different combinations of 4 shirts can you pack for a trip if you have 15 shirts?
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OpenStudy (kinggeorge):
Choose 4, not 3.
OpenStudy (kinggeorge):
\[15!\over{4!(15-4)!}\]
OpenStudy (anonymous):
oh, so I can apply \[C =n!\div r!(n-r)!\] ?
OpenStudy (kinggeorge):
That's the correct formula to use in this case.
OpenStudy (anonymous):
Cool, thanks!
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OpenStudy (kinggeorge):
You're welcome.
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