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another gmatprep

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Director
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Joined: 23 May 2008
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another gmatprep [#permalink]

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New post 09 Sep 2008, 16:54
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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Manager
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Joined: 28 Aug 2008
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Re: another gmatprep [#permalink]

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New post 09 Sep 2008, 17:17
IMO... A

4^17-2^28=

2^34- 2^28 = 2^6 = 64

2 is greatest prime factor (not 3,5,7,11)

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Joined: 11 May 2008
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Re: another gmatprep [#permalink]

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New post 09 Sep 2008, 18:24
2^34-2^28
2^28(2^6-1)
2^28*63
2^28*7*9.
so ans = 7

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Re: another gmatprep   [#permalink] 09 Sep 2008, 18:24
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