Compute the following sum for any given x and positive integer n.
Here m! denotes the factorial of m, which the product of all natural numbers upto m. Thus,
2! = 1x2 = 2
3! = 1x2x3 = 6
5! = 1x2x3x4x5 = 120
Avoid using for/while loops.
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You should use tolerance based test-suites and not isequal while dealing with floats.
A tolerance has been added to the test suite.