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Factorial means multiplying any number by every real positive whole number less than itself.

The number of sequences that can exist with a set of items, derived by multiplying the number of items by the next lowest number until 1 is reached. In mathematics, product of all whole numbers up to the number considered. The special case zero factorial is defined to have value 0!=1, consistent with the combinatorial interpretation of there being exactly one way to arrange zero objects. The notation n factorial (n!) was introduced by Christian Kramp in 1808.

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**Formula:**

**n! = 1*2*3*...*n**

The factorial of a non-negative integer n is the product of all positive integers less than or equal to n. In mathematics, there are n! ways to arrange n objects in sequence. "The factorial n! gives the number of ways in which n objects can be permuted."

* Example*:

Simplify the following: 4! +3!, 4! - 3!, 4! * 3!, 4! /3!

4! = 4*3*2*1 =

4! = 3*2*1 =

4! + 3! = 12+ 6 =

4! - 3! =12 - 6 =

3!*2! = 12*6 =

3! / 2! = 12/ 6 =