shortcut to finding prime factors of a question?

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coolgirl26: Senior | Next Rank: 100 Posts; Posts: 71; Joined: Tue Mar 03, 2009 1:24 pm

by coolgirl26 » Wed Mar 04, 2009 7:48 pm

I find that"simple" questions are taking up most of my time and i run out of tim on tests

plz provide a short cut

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Source: Beat The GMAT — Problem Solving | Wed Mar 04, 2009 7:48 pm

NareshCS: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Sun Jan 11, 2009 10:47 pm

by NareshCS » Wed Mar 04, 2009 9:30 pm

4^17-2^28
(2^2)^17-2^28
2^34-2^28
2^28*(26-1)
2^28*(64-1)
2^28*63
2^28*7*3^2
the greatest prime factor = 7

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