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# Problem solving

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Intern
Joined: 12 Feb 2009
Posts: 8

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Schools: LBS, UPenn, IMD

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16 May 2009, 06:53
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Question Stats:

100% (00:37) correct 0% (00:00) wrong based on 0 sessions

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In my opinion it is a digit, which cannot be divided by 11
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Kudos [?]: [0], given: 5

SVP
Joined: 04 May 2006
Posts: 1881

Kudos [?]: 1399 [0], given: 1

Schools: CBS, Kellogg

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16 May 2009, 09:16
In my opinion it is a digit, which cannot be divided by 11

Yes, the question asks which one of the followings is the sum of M and N EXCEPT...

M=ab, N=ba
M+N = (10a+b) +(10b+a)=11(a+b)
Just use POE to eliminate any choice that is divisible by 11
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Kudos [?]: 1399 [0], given: 1

Re: Problem solving   [#permalink] 16 May 2009, 09:16
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