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find n if n*n!+n!=720, if n!=n*(n-1)*(n-2)...2*1

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find n if n*n!+n!=720, if n!=n*(n-1)*(n-2)...2*1

n = 5

5 * 5! + 5! =600 + 120 = 720

Guest Aug 25, 2020

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