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Let f(x)= int0^oo e^(-x) x^(n-1) \ dx, n...

Let `f(x)= int_0^oo e^(-x) x^(n-1) \ dx, n in NN, x in QQ^+` Then the value of `f(5)` is (i)`20` (ii)`5` (iii)`24` (iv)`120`

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