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

 Dec 30, 2019
 #1
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n! (1+n) = 720    n = 5 by a couple of trials

 Dec 31, 2019
 #2
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thank you!!

atlas9  Dec 31, 2019

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