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# What is the greatest prime factor of 2^100 - 2^96? A. 2 B. 3

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Manager
Joined: 06 Nov 2008
Posts: 53
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What is the greatest prime factor of 2^100 - 2^96? A. 2 B. 3 [#permalink]

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09 Nov 2008, 16:31
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

What is the greatest prime factor of 2^100 - 2^96?

A. 2
B. 3
C. 5
D. 7
E. 11
SVP
Joined: 05 Jul 2006
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Kudos [?]: 358 [0], given: 49

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09 Nov 2008, 16:33
haichao wrote:
What is the greatest prime factor of 2^100 - 2^96?

A. 2
B. 3
C. 5
D. 7
E. 11

2^96(2^4 -1) = 2^96 * 15 THUS 5 IS THE GREATEST.........C
Re: prime factor---28   [#permalink] 09 Nov 2008, 16:33
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