Posted by **Dee** on Friday, August 28, 2009 at 3:57pm.

Need a verification:

Combinations of n items taken r at a time: C9n,r)= n!/(n-r)!*r!

C(8,0)

8!/(8-0)!*(0)! = 8!/8!*0! = 0 or Answer is 0 or 1?

- Math: Permutations and Combinations -
**MathMate**, Friday, August 28, 2009 at 4:42pm
The formula is correct, noting the parentheses, i.e.

C(n,r) = n!/((n-r)!r!)

Since 0!=1, the expression

8!/((8-0)!*(0)!) = 1

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