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OpenStudy (anonymous):
you own 4 hats and are taking 2 on vacation. how many ways can you choose 2 hats from the 4?
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OpenStudy (anonymous):
4C2 (4 Choose 2) = 4! / [2! * (4-2)!] = 6
OpenStudy (unklerhaukus):
6 combinations |dw:1332814601250:dw|
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