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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
Posts: 158

Kudos [?]: 20 [0], given: 151

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

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06 Apr 2013, 04:47
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5% (low)

Question Stats:

86% (00:43) correct 14% (00:28) wrong based on 79 sessions

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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, 04:57, edited 2 times in total.
Renamed the topic and edited the question.

Kudos [?]: 20 [0], given: 151

Math Expert
Joined: 02 Sep 2009
Posts: 41892

Kudos [?]: 129179 [1], given: 12194

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

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06 Apr 2013, 05:02
1
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Expert's post
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..."
_________________

Kudos [?]: 129179 [1], given: 12194

Manager
Joined: 06 Jun 2010
Posts: 158

Kudos [?]: 20 [0], given: 151

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

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06 Apr 2013, 10:00
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

Kudos [?]: 20 [0], given: 151

Senior Manager
Joined: 16 Dec 2011
Posts: 421

Kudos [?]: 232 [0], given: 70

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

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06 Apr 2013, 20:41
I have seen some good comments on 800score in MGMAT forums. But this question is definitely a bad one.

Kudos [?]: 232 [0], given: 70

Math Expert
Joined: 02 Sep 2009
Posts: 41892

Kudos [?]: 129179 [0], given: 12194

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

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07 Apr 2013, 22:57
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.
_________________

Kudos [?]: 129179 [0], given: 12194

Re: If a and b are both even integers, which of the following   [#permalink] 07 Apr 2013, 22:57
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