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Factorial

The product of a given integer and all smaller positive integers. The factorial of n is written n! and is read aloud "n factorial".

Note: By definition, 0! = 1.

 

Formula: n! = n·(n – 1)·(n – 2) · · · 3·2·1
Example: 6! = 6·5·4·3·2·1 = 720

 

See also

Permutation formula, combination formula, binomial coefficient

 


  this page updated 15-jul-23
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons
Copyright © 2000 by Bruce Simmons
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