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# Which of the following cannot be the greatest common

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Which of the following cannot be the greatest common [#permalink]  18 May 2007, 04:49
Which of the following cannot be the greatest common divisior of two positive integers x and y?

A. 1
B. x
C. y
D. x - y
E. x + y
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Joined: 01 May 2006
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(E) for me

x + y > x as y > 0
<=> x/(x+y) < 1

and so is y/(x+y) < 1
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