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# another gmatprep

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Director
Joined: 23 May 2008
Posts: 757

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09 Sep 2008, 16:54
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Manager
Joined: 28 Aug 2008
Posts: 98

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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)
Current Student
Joined: 11 May 2008
Posts: 552

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09 Sep 2008, 18:24
2^34-2^28
2^28(2^6-1)
2^28*63
2^28*7*9.
so ans = 7
Re: another gmatprep   [#permalink] 09 Sep 2008, 18:24
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# another gmatprep

Moderator: chetan2u

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