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Calculating the Factorial of a Number
In mathematics, the notation n! represents the factorial of the nonnegative integer n. The factorial of n is the product of all the nonnegative integers from 1 up through n. For example:
7! = 1 × 2 × 3 × 4 × 5 × 6 × 7 = 5,040
and
4! = 1 × 2 × 3 × 4 = 24
Design a

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