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Statistics - Factorial
Factorial is a function applied to natural numbers greater than zero. The symbol for the factorial function is an exclamation mark after a number, like this: 2!
Formula
${n! = 1 \times 2 \times 3 ... \times n}$
Where −
${n!}$ = represents factorial
${n}$ = Number of sets
Example
Problem Statement:
Calculate the factorial of 5 i.e. 5!.
Solution:
Multiply all the whole numbers up to the number considered.
${5! = 5 \times 4 \times 3 \times 2 \times 1 , \\[7pt]
\, = 120}$
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