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Numbers

by Akansha » Sun May 22, 2011 1:50 am
If x and y are integers greater than 1, is x a multiple of y? A
a. 3y2 + 7y = x
b. x2 - x is a multiple of y

OA is A
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Source: — Data Sufficiency |
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by Frankenstein » Sun May 22, 2011 2:23 am
Hi,

From(1) : y(3y+7) = x. So, x is (3y+7) times y and (3y+7) is an integer too. So, x is a multiple of y
Sufficient

From(2) : Choose x= 4, x^2-x = 12(multiple of 3), If y = 3, then x is not multiple of y
If y = 2, then x is a multiple of y
Insufficient

Hence A

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