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Is MN Odd?

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Is MN Odd? [#permalink] New post 10 Oct 2012, 20:24
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A
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  25% (medium)

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78% (01:10) correct 22% (00:16) wrong based on 36 sessions
Daily question from "GMAT hacks-Jeff Sackmann"

Is MN Odd? M,N are integers.

(1) M even
(2) N odd



Edited to ensure M,N are integers , as guided by Bunuel, Thanks a lot Bunuel.
[Reveal] Spoiler: OA

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Last edited by thevenus on 10 Oct 2012, 23:13, edited 2 times in total.
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Re: Is MN Odd? [#permalink] New post 10 Oct 2012, 22:54
Expert's post
Is MN Odd?

Notice that we are not told that M and N are integers.

(1) M even. If N is an integer, then \(MN=even*integer=even\), so the answer is NO but if \(N=\frac{odd}{M}\), then \(MN=M*\frac{odd}{M}=odd\) (for example \(M=2\) and \(N=\frac{3}{2}\) --> \(MN=3=odd\)), so the answer is YES. Not sufficient.

(2) N odd. If M=even, then the answer is NO but if M=odd then the answer is YES. Not sufficient.

(1)+(2) MN=even*odd=even, so the answer to the question is NO. Sufficient.

Answer: C.
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Re: Is MN Odd? [#permalink] New post 16 Oct 2012, 13:30
I dont agree with the explanation. It is clearly mentioned than M & N are integers. How can then N be exampled as 3/2.

IMO, the answer is (A). If both M&N are integers, as long as one of them is even the product MN is even.
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Re: Is MN Odd? [#permalink] New post 17 Oct 2012, 03:43
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vikasacha wrote:
I dont agree with the explanation. It is clearly mentioned than M & N are integers. How can then N be exampled as 3/2.

IMO, the answer is (A). If both M&N are integers, as long as one of them is even the product MN is even.


In the initial post it was not mentioned that M and N are integers. This part was added later.

thevenus: please check the questions when posting.
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Re: Is MN Odd? [#permalink] New post 17 Oct 2012, 03:53
vikasacha wrote:
I dont agree with the explanation. It is clearly mentioned than M & N are integers. How can then N be exampled as 3/2.

IMO, the answer is (A). If both M&N are integers, as long as one of them is even the product MN is even.


The question was edited , please refer the red-font statement added below the question.
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Re: Is MN Odd?   [#permalink] 17 Oct 2012, 03:53
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