Factorials

Chapter 4 - Algebra Reference

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Definition of a Factorial

Denoted by the symbol “!” after an integer; the product of that integer and all integers in descent to 1.

Example of a factorial:

5! = 5 x 4 x 3 x 2 x 1

5! = 120

 

Strange Factorials

0! = 1          1! = 1

 

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