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# Is x/y an integer? 1). 2x/y is an integer 2). Y is odd

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Is x/y an integer? 1). 2x/y is an integer 2). Y is odd [#permalink]

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01 Apr 2008, 19:30
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Is x/y an integer?
1). 2x/y is an integer
2). Y is odd.
Manager
Joined: 28 Sep 2007
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01 Apr 2008, 19:34
I get E.

1. x/y can be 1/2 or an integer, so insuff

2. Y is odd. That does not tell us anything. so Insuff.
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02 Apr 2008, 16:39
Shouldn't it be C ?

If you combine both st_1 and st_2 x/y has to be an integer.

For example x/y = 1/2 will become an invalid case...

lets assume y = 7. For 2x/y to be an integer, one will be forced to pick values of x like 7,14,21,28...making x/y an integer.

No ?
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Manager
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02 Apr 2008, 21:24
neelesh wrote:
Shouldn't it be C ?

If you combine both st_1 and st_2 x/y has to be an integer.

For example x/y = 1/2 will become an invalid case...

lets assume y = 7. For 2x/y to be an integer, one will be forced to pick values of x like 7,14,21,28...making x/y an integer.

No ?

I think is C too.
For the same reason.
Current Student
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03 Apr 2008, 15:23
what if x was something like 5/2 or 3/2??

and y was 5 or 3..

get it? dont assume x is an integer
Senior Manager
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03 Apr 2008, 15:25
fresinha12 wrote:
what if x was something like 5/2 or 3/2??

and y was 5 or 3..

get it? dont assume x is an integer

Good point....
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Re: DS number properties   [#permalink] 03 Apr 2008, 15:25
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