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# What is the greatest common factor of the positive integers

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What is the greatest common factor of the positive integers [#permalink]

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14 Feb 2007, 05:06
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What is the greatest common factor of the positive integers j and k?
(1) k = j + 1
(2) jk is divisible by 5.
SVP
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14 Feb 2007, 06:11
(A) for me

From 1
k = j + 1... the greatest common factor is 1.

SUFF.

From 2
k*j = 5*i where i is an integer.

o If k=1 and j=5, then the greatest common factor is 1
o If k=2 and j=10, then the greatest common factor is 2

INSUFF.
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14 Feb 2007, 16:30
What is the greatest common factor of the positive integers j and k?
(1) k = j + 1
(2) jk is divisible by 5.

from one

2 successive intigers ( as far as i know any 2 successive intigers are said to be relatively prime

ie: the gcf =1

from two

insuff

A TOO
14 Feb 2007, 16:30
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