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carrillo1228: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Mon Nov 30, 2009 9:34 am; Thanked: 1 times

by carrillo1228 » Tue Mar 23, 2010 8:26 am

So..... on the Manhattan GMAT text book, I was going over advanced equation strategy and there is one example that I can't get my hands around and was wondering if anyone could help me understand.

I understand the start to Factor part....... but I don't understand how they get to the final part...

thanks

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Source: Beat The GMAT — Quantitative Reasoning | Tue Mar 23, 2010 8:26 am

kstv: Legendary Member; Posts: 610; Joined: Fri Jan 15, 2010 12:33 amFollowed by: 2 members; Thanked: 47 times

by kstv » Tue Mar 23, 2010 8:49 am

m^n(1-m^-1) -------------------as m-Â¹=1/m

= m^n(1- 1/m)

m^n(1- 1/m)

= m^n{(m-1)/m }

= m^n^/m {m-1}

= m^n-1(m-1)

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