Problem 46828. Approximate functions 2 (★★★★)
Compute the following sum for any given x and number of terms n.
Here m! denotes the factorial of m, which the product of all natural numbers upto m, for example
2! = 1x2 = 2
3! = 1x2x3 = 6
5! = 1x2x3x4x5 = 120
If x=1 and n = 4, we have
Avoid using for/while loops.
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