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# If a and b are both even integers, which of the following

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Manager
Joined: 06 Jun 2010
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If a and b are both even integers, which of the following [#permalink]

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06 Apr 2013, 03:47
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If a and b are both even integers, which of the following must be true?

A. The product of a and b is odd
B. The sum of a and b is odd
C. a - b > 0
D. a raised to the b power is even
E. (a + b)/4 is even

I know the answer but my question is why? Since zero is an even integer,if we consider 2^0->1 and thus D cant be always true.
[Reveal] Spoiler: OA

Last edited by Bunuel on 06 Apr 2013, 03:57, edited 2 times in total.
Renamed the topic and edited the question.
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Re: If a and b are both even integers, which of the following [#permalink]

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06 Apr 2013, 04:02
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shreerajp99 wrote:
If a and b are both even integers, which of the following must be true?

A. The product of a and b is odd
B. The sum of a and b is odd
C. a - b > 0
D. a raised to the b power is even
E. (a + b)/4 is even

I know the answer but my question is why? Since zero is an even integer,if we consider 2^0->1 and thus D cant be always true.

You are right, D cannot be the correct answer: 2^0=1=odd. So, none of the options must be true.

I guess the question should read "if a and b are both positive even integers..."
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Manager
Joined: 06 Jun 2010
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Kudos [?]: 19 [0], given: 151

Re: If a and b are both even integers, which of the following [#permalink]

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06 Apr 2013, 09:00
Bunuel,does this mean 800score tests questions are not upto the mark?I took one of their quant tests today and got 31/37.Do u think their questions are a fair indicator of my actual level?

Thanks,
Shreeraj
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Re: If a and b are both even integers, which of the following [#permalink]

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06 Apr 2013, 19:41
I have seen some good comments on 800score in MGMAT forums. But this question is definitely a bad one.
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Posts: 36601
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Kudos [?]: 93483 [0], given: 10563

Re: If a and b are both even integers, which of the following [#permalink]

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07 Apr 2013, 21:57
shreerajp99 wrote:
Bunuel,does this mean 800score tests questions are not upto the mark?I took one of their quant tests today and got 31/37.Do u think their questions are a fair indicator of my actual level?

Thanks,
Shreeraj

I've seen decent questions from 800score, so I wouldn't discard this source based only one question.
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Re: If a and b are both even integers, which of the following   [#permalink] 07 Apr 2013, 21:57
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# If a and b are both even integers, which of the following

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