how i m going to assign a value of 2!/6 into a variable ???

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! Is the factorial symbol. a factorial is defined as n! = 1 * 2 * 3 * ... * n-1 * n. Also 0! = 1. You will ned to write a function that will calculate that. If you know how to use a for loop it is pretty simple to do.

any example ???

yes there's a lot if you search

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