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OpenStudy (anonymous):
You own 6 hats and are taking 2 on vacation.In how many ways can you choose 2 hats from the 6?
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OpenStudy (anonymous):
combination problem
OpenStudy (anonymous):
how many different groups of 2 can you make from a group of 6 6!/2!(6!-2!)
OpenStudy (anonymous):
6!/2!x4!
OpenStudy (anonymous):
6x5/2x1=15
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