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What is the greatest common divisor of integers r and s ?
(1) The greatest common divisor of 2r and 2s is 10.
(2) r and s are both odd.
DS21281
(1) The greatest common divisor of 2r and 2s is 10.
(2) r and s are both odd.
DS21281
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23 May 2020, 10:36
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Bunuel
What is the greatest common divisor of integers r and s ?
(1) The greatest common divisor of 2r and 2s is 10.
(2) r and s are both odd.
DS21281
(1) The greatest common divisor of 2r and 2s is 10.
(2) r and s are both odd.
DS21281
Statement 1: The greatest common divisor of 2r and 2s is 10.
Given 2 integers r, s
greatest divisor of 2r, 2s = 10 => greatest divisor of r, s = 5. (for any combination of r, s).
So Sufficient.
Statement 2: r and s are both odd.
Let r = 3, s = 5.
Then the greatest divisor would be 1.
Let r = 3, s = 9
Then the greatest divisor would be 3.
So there would be a lot of such combinations depending on which the value of greatest divisor could change.
So Insufficient,
Answer A.
General Discussion
altairahmad
10 Jun 2020, 09:07
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