What is factorial, Mathematics

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Q. What is Factorial?

A factorial is a number with a factorial sign, !, after it.

5! is read "five factorial."

3! is read "three factorial."

The factorial of a natural number is the product of that number and all the whole numbers less than it, stopping at 1. In general,

n! = n.(n-1).......2.1

For completeness, 0! is defined to be 1.

The number of permutations equals the factorial of the number of objects.


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