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PS-Must Be True- 2

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Director
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PS-Must Be True- 2 [#permalink]

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New post 01 Apr 2009, 02:13
1
00:00
A
B
C
D
E

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If a and b are both even non-zero 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


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Re: PS-Must Be True- 2 [#permalink]

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New post 01 Apr 2009, 16:45
Bad question.

If you give a and b are positive integers then D will be true else all choices are wrong.

I can prove C D and E true if question changes to could be true instead of must be true.

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Re: PS-Must Be True- 2 [#permalink]

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New post 02 Apr 2009, 03:20
OE says

It's easiest to find examples that prove the other four choices wrong. For answers A, B, and C, choosing a=2 and b=4 makes the statements incorrect. For answer E, choosing a=4 and b=8 makes the statement false. Answer D is the only one that holds true always.


thx
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Re: PS-Must Be True- 2 [#permalink]

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New post 02 Apr 2009, 07:11
nitya34 wrote:
OE says

It's easiest to find examples that prove the other four choices wrong. For answers A, B, and C, choosing a=2 and b=4 makes the statements incorrect. For answer E, choosing a=4 and b=8 makes the statement false. Answer D is the only one that holds true always.


thx


Either the OE is wrong, or there's a word missing from the question. What's the source? D certainly must be true *if* a and b are *positive* even integers. The question (as posted) only says that they are 'non-zero', which means they could be negative. If a = 2, and b = -2, then a^b = 1/4, and is not an integer, so certainly is not even.
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Re: PS-Must Be True- 2 [#permalink]

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New post 15 Apr 2009, 16:36
it's funny how i automatically assumed the numbers are positive. is that word supposed to be in the question? also, just for my fyi, what does oe stand for?
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Re: PS-Must Be True- 2 [#permalink]

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New post 16 Apr 2009, 05:27
OE = Offical Explanation
OA = Official Answer
gmat911 wrote:
it's funny how i automatically assumed the numbers are positive. is that word supposed to be in the question? also, just for my fyi, what does oe stand for?
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Re: PS-Must Be True- 2 [#permalink]

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New post 16 Apr 2009, 09:59
I also think it's a bad question.
Either the word "positive" in the question stem, or another answer choice 'none' is missing.

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Re: PS-Must Be True- 2   [#permalink] 16 Apr 2009, 09:59
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