Asked by Davin
Express (12/4) in factorial notation (i.e. using the nCr formula). Evaluate.
Answers
Answered by
oobleck
12C4 = 12! / 8!4! = 12*11*10*9 / 1*2*3*4
Count down r factors from n on top, count up r factors from 1 on the bottom
Count down r factors from n on top, count up r factors from 1 on the bottom
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