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 Factorial:  The expression n! is a symbol to indicate the product of all counting numbers beginning with n and counting backwards to 1.

Factorial - MathWorld: Math World defines a factorial and gives other relating links.

Factorial - Wikipedia: A website where Wikipedia goes into detail about factorials.

Table of Factorials: Table of Factorials 1! - 30!

Factorial: A definition and explanation of factorials.

Factorial: Another definition of factorials.