SOLUTION: how would i do this? Indicate the formula for the following conditions C(n,r)=

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Question 146145: how would i do this? Indicate the formula for the following conditions
C(n,r)=
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The combination of n things taken r at-a-time is given by:
C%5Bn%2Cr%5D+=+n%21%2Fr%21%28n-r%29%21
N.B. ! = factorial.