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OpenStudy (anonymous):
there are 20 swimmers on the swim team. how many different groups of 5 can there be?
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OpenStudy (anonymous):
C(20,5) = 20! 20! 20*19*18*17*16 ----------- = ----------- = ---------------- (20 - 5)! * 5! 15! * 5! 5!
OpenStudy (anonymous):
what do the exclamation marks ! mean???
OpenStudy (anonymous):
Those are factorial symbols. Your teacher HAD to have covered that if you all are doing problems like this. Have you heard of factorial?
OpenStudy (anonymous):
no haha
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