05 - Java program to find Factorial of number.

Here we will learn a Java program to find factorial of a number.

Factorial of a number is multiplication of all integers smaller than or equal to that number. For example
4! = 4*3*2*1 = 24  
5! = 5*4*3*2*1 = 120  
6! =6*5*4*3*2*1 = 720.

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