Advanced Math

Question :
What is a 'Factorial' ?

Answer :
Factorial is the product of all positive integers from 1 upto a given number n, inclusive.
Factorial is denoted by the symbol n !
For example:

5 ! = 1 x 2 x 3 x 4 x 5 = 120
The special case 0! is defined to have value 0! = 1.
The Factorial function can be defined as:

Some applications of factorials:

Factorials are used in combinatorics.
Factorials turn up in calculus.
Factorials are used in probability theory.
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