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# If a and b are positive integers divisible by 6, is 6 the

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If a and b are positive integers divisible by 6, is 6 the [#permalink]  18 Feb 2008, 11:57
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If a and b are positive integers divisible by 6, is 6 the greatest common divisor of a and b?

(1) a = 2b + 6

(2) a = 3b
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Re: DS: GCD [#permalink]  18 Feb 2008, 12:07
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is the OA -A?

(1) a = 2b + 6 -> b=6,a=18 b=12,a=30 GCD is 6 for both sufficient

(2) a = 3b b=6,a=18
b=12,a=36 G.C.D is 12 insufficient

thus A
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Re: DS: GCD   [#permalink] 18 Feb 2008, 12:07
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