How do you calculate combinations of 10 numbers?

1 Answer
Wataru
Nov 27, 2014

If r numbers are chosen, then the number of all combinations can be found by

C(10,r)={P(10,r)}/{r!}={10 cdot 9 cdot cdots cdot (10-r+1)}/{r!}

Example

If r=3, then

C(10,3)={10 cdot 9 cdot 8}/{3 cdot 2 cdot 1}=120 combinations

I hope that this was helpful.

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