Learning Mathematics for IIT JEE
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Tuesday, December 16, 2008
Factorial
Factorial: the continued product of first n natural numbers is called the “n factorial” and is denoted by n! or
i.e. n! = 1*2*3…*(n-1)*n
4! = 1*2*2*4
n! is defined for positive integers only.
0! is defined as 1.
n! = n*(n-1)!
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