Factorial NotationThe expression 6 × 5 × 4 × 3 × 2 × 1 = can be written as 6!, which is read as “six factorial.” In general, n! is the product of all the counting numbers beginning with n and counting backwards to 1. We define 0! to be 1.
Example : Find the value of each expression: a) 3! b) 0! c) 5! d) 1! e) 3! + 2! f)
Solution: a) 3! = 3 × 2 × 1 = 6 b) 0! = 1 c) 5! = 5 × 4 × 3 × 2 × 1 = 120 d) 1! = 1 e) 3! + 2! = (3 × 2 × 1) + (2 × 1) = 8 f)
The following video gives same basic information on factorials and shows how to evaluate some factorial examples.
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