Must be an odd integer : PS Archive
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# Must be an odd integer

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SVP
Joined: 21 Jul 2006
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Must be an odd integer [#permalink]

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23 Aug 2009, 01:06
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Difficulty:

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Question Stats:

67% (01:16) correct 33% (00:13) wrong based on 13 sessions

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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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
Joined: 27 May 2009
Posts: 281
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Kudos [?]: 354 [0], given: 18

Re: Must be an odd integer [#permalink]

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23 Aug 2009, 01:33
It should be B .... what is the source
Manager
Joined: 28 Jul 2009
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Location: India
Schools: NUS, NTU, SMU, AGSM, Melbourne School of Business
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Re: Must be an odd integer [#permalink]

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24 Aug 2009, 02:26
B has to be answer. You are right tarek99.
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Manager
Joined: 09 Aug 2009
Posts: 53
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Kudos [?]: 8 [0], given: 1

Re: Must be an odd integer [#permalink]

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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
Joined: 13 Jan 2009
Posts: 170
Followers: 4

Kudos [?]: 25 [0], given: 9

Re: Must be an odd integer [#permalink]

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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?
SVP
Joined: 21 Jul 2006
Posts: 1538
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Kudos [?]: 739 [0], given: 1

Re: Must be an odd integer [#permalink]

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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!
Manager
Affiliations: CFA Level 2 Candidate
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Schools: RD 2: Darden Class of 2012
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Re: Must be an odd integer [#permalink]

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24 Aug 2009, 11:11
1
KUDOS
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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