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

 

P.S. The * represent multiplication dots, but I'm not sure what the *** means, they just put three multiplication dots there.

 Sep 4, 2023
 #2
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is 5 because 5 * 5! +5! = 720. I am not sure what *** means, but I think it means going on until something, which is actually true. 5! = 5 * 4 * 3 * 2 * 1. You can also search it up. I'm not sure why they put *** though. It is more clear to put ......

 Sep 4, 2023
edited by history  Sep 4, 2023

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