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Must be an odd integer

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SVP
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Joined: 21 Jul 2006
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Must be an odd integer [#permalink] New post 23 Aug 2009, 01:06
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

67% (01:16) correct 33% (00:13) wrong based on 8 sessions
If x is an integer, which of the following must be an odd integer?

A. 2x + 2

B. 4x + 3

C. 12x - 6

D. 13x

E. 14x



I'm getting B as my answer, however the OA is C. Why is that?
Senior Manager
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Joined: 27 May 2009
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Re: Must be an odd integer [#permalink] New post 23 Aug 2009, 01:33
It should be B .... what is the source
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Schools: NUS, NTU, SMU, AGSM, Melbourne School of Business
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Re: Must be an odd integer [#permalink] New post 24 Aug 2009, 02:26
B has to be answer. You are right tarek99.
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Manager
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Re: Must be an odd integer [#permalink] New post 24 Aug 2009, 02:56
tarek99 wrote:
If x is an integer, which of the following must be an odd integer?

A. 2x + 2

B. 4x + 3

C. 12x - 6

D. 13x

E. 14x



I'm getting B as my answer, however the OA is C. Why is that?


Can you post the explanation??
Manager
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Schools: Harvard Business School, Stanford
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Re: Must be an odd integer [#permalink] New post 24 Aug 2009, 04:24
Tarek, this is the second question you are posting with the wrong OA, can you say the source of these questions?
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Re: Must be an odd integer [#permalink] New post 24 Aug 2009, 09:33
There's no OE. I also agree with all of you that the OA should be B. There's definitely a typo with the OA. Thanks!
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Re: Must be an odd integer [#permalink] New post 24 Aug 2009, 11:11
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A Couple of Rules

Even Integer x (E/O) = Even
Odd Integer x (E/O) = Even or Odd
Even (+/-) Even = Even
Even (+/-) Odd = Odd
Odd (+/-) Odd = Even
No division here so we won't go through

As above we are looking for an example where we have an even +/- Odd.

Quick Scan shows B - Not cannot be D since the above rule shows could be even or odd.
Re: Must be an odd integer   [#permalink] 24 Aug 2009, 11:11
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