(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm trying to prove k*(k!)=(k+1)!-1

2. Relevant equations

3. The attempt at a solution

This is how far I've gotten:

k[k(k-1)(k-2)....1)]

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# Factorial simplifying

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