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y / x is odd

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by sanju09 » Tue Mar 03, 2009 4:53 am
Is x + y even?

(1) xy is even.

(2) y / x is odd.
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Re: y / x is odd

by piyush_nitt » Tue Mar 03, 2009 5:25 am
sanju09 wrote:Is x + y even?

(1) xy is even.

(2) y / x is odd.
1. Product can be even , if atleast 1 number is even.

e.g x = 4 , y = 3 xy = 12 , x+ y odd

or x = 4 , y = 4 , xy = 16 x+y even

NOT Suff

2. y/x is odd

y/x can be odd , if num is odd and denom is odd

e.g y = 15 , x = 5

or

if num is even and denom is even

e.g y = 24 , x = 8

In both the cases
x+y is even .

hence suff

IMO B
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