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User:Temperal/The Problem Solver's Resource7

Revision as of 20:17, 5 October 2007 by Xpmath (talk | contribs) (→Factorial)



The Problem Solver's Resource
Introduction Other Tips and Tricks Methods of Proof You are currently viewing page 7.

Combinatorics

Factorial

The factorial of a number $n$ is $n(n-1)(n-2)...(1)$ or also as $\prod_{a=0}^{n-1}(n-a)$,and is denoted by $n!$.

Also, $0!=1$.

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