Mathematica Asked on April 26, 2021
Sum[((-1)^(i + 1)*Binomial[n, i]*(n - i)!)/n!, {i, 1, n}]
This cause a Recursion problem.
As the comment said, If simplify the formula and then sum it, problem vanished.
((-1)^(i + 1)*Binomial[n, i]*(n - i)!)/n! // FullSimplify // Sum[#, {i, 1, n}] &
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