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# Problem solving

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Joined: 12 Feb 2009
Posts: 8
Schools: LBS, UPenn, IMD
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Problem solving [#permalink]  16 May 2009, 05:53
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100% (01:37) correct 0% (00:00) wrong based on 0 sessions
In my opinion it is a digit, which cannot be divided by 11
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Joined: 04 May 2006
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Re: Problem solving [#permalink]  16 May 2009, 08:16
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
_________________
Re: Problem solving   [#permalink] 16 May 2009, 08:16
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# Problem solving

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