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 Post subject: Exponent Question from GMAT Prep 2Posted: Thu Jan 14, 2010 1:59 am

Joined: Sun Jul 19, 2009 4:32 pm
Posts: 2
What is the greatest prime factor of 4^17 - 2^28?

The answer should be 7. Thank you.

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 Post subject: Re: Exponent Question from GMAT Prep 2Posted: Thu Jan 14, 2010 4:19 am

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
4^17 - 2^28

(2^2)^17 - 2^28

2^34 - 2^28

(2^28)(2^6 - 1)

(2^28)(63)

(2^28)(7*3*3)

- Veritas Help

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