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========What is Factorial?========
Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!
5! = 5 * 4 * 3 * 2 * 1
= 120
Here, 5! is pronounced as "5 factorial", it is also called "5 bang" or "5 shriek".
The factorial is normally used in Combinations and Permutations (mathematics).
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