In mathematical concept, the end product of given postive(+) integers(n) or number is called as factorial of that number which is denoted by "n!". Factorial is also called as the end product of an integer and all the integers falling under it. For example : The factorial of Number 3 (3!) is equals to 6 (3 x 2 x 1= 6). Factorial calculations are occured in many areas of maths just like in case of mathematical analysis, algebra, combinatorics etc. Earlier in 12th century 'Indian Scholars' started using the trend of factorial calculations for counting permutations. In 1808 one of the well-known french mathematician Christian Kramp introduced the notation of 'n!' for factorial. The basic formula for defining the factorial function is : n! = 1.2.3...(n-2).(n-1).n i.e for example 5! = 5 x 4 x 3 x 2 x 1 = 120.