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Factorial in Mathematics

Posted by Ravi Kumar at Tuesday, September 15, 2009
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Factorial is defined for any positive integer. It is denoted by !. Thus “Factorial n” is written as n!. n! is defined as the product of all the integers from 1 to n.

Thus n! = 1.2.3.. ... (n-1),n.

Example 5! = 1*2*3*4*5 = 120

0! is defined to be equal to 1.
Therefore 0! = 1 and 1! = 1

n!=n*(n-1)!
eg: 10!=10*(10-1)!=10*(9)!

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