# Math: Permutations and Combinations

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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 -

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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