DS

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DS

by muzali » Mon Nov 10, 2008 9:45 pm
If x and y are positive integers and x is a multiple of y, is y = 2?
(1) y ≠ 1
(2) x + 2 is a multiple of y

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Re: DS

by logitech » Mon Nov 10, 2008 9:54 pm
muzali wrote:If x and y are positive integers and x is a multiple of y, is y = 2?
(1) y ≠ 1
(2) x + 2 is a multiple of y
1)insuf - it means y>1
2) x + 2 is a multiple of y

(x+2) = Y*INTEGER

from the stem we know that X=Y*INTEGER

if we combine these two statements:

Y*INTEGER+2=Y*INTEGER

Y( Integer - INTEGER) = 2

we can get 2 in two ways : 2x1 or 1x2

INSUF - we dont know which one is 2

1+2 ) SUFF

we know y is not equal to 1 from first statement

Hence, C

Am I right ?
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by muzali » Mon Nov 10, 2008 10:11 pm
Thanks. You are correct.