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If x and y are positive integers, which of the following

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Joined: 08 Dec 2006
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Location: United States
Concentration: Entrepreneurship, General Management
Schools: Harvard Business School (HBS) - Class of 2014
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If x and y are positive integers, which of the following [#permalink]  08 Jan 2009, 12:49
If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?
5
5(x – y)
20x
20y
35x
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Joined: 29 Aug 2007
Posts: 2493
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Kudos [?]: 578 [0], given: 19

Re: GCF!!! Don't need an OA but explanation! [#permalink]  08 Jan 2009, 14:44
Abhishek.pitti wrote:
If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?
5
5(x – y)
20x
20y
35x

C. 20x

20x could be a factor of 20y but can not be a factor of 35x.
_________________
Re: GCF!!! Don't need an OA but explanation!   [#permalink] 08 Jan 2009, 14:44
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