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HELP PLEASE - Distributive property with !

How does the GMAT book come up with

k(k-1)! = k!

I always come up with (kk!)-k as a result.
I really don't understand how they use distributive property in this one.

by Alyssa345

Fri Jun 18, 2021 1:53 pm
Forum: Problem Solving
Topic: HELP PLEASE - Distributive property with !
Replies: 2
Views: 496