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OpenStudy (anonymous):
how do you evaluate 9C9 ------- 9P0
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OpenStudy (perl):
you should use the definition of nCr and nPr
OpenStudy (perl):
n C r = n! / [ (n-r)! r! ] n P r = n! / ( n-r)!
OpenStudy (perl):
9 C 0 = 9! / [ (9 - 0)! 0! ] can you solve that?
OpenStudy (anonymous):
Yes, the ans. is zero
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