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# If mn = K, what is the value of K ?

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Joined: 29 Mar 2010
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GMAT 1: 590 Q28 V38
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WE: Accounting (Hospitality and Tourism)
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Kudos [?]: 85 [0], given: 16

If mn = K, what is the value of K ? [#permalink]

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09 May 2012, 02:41
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15% (low)

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75% (01:57) correct 25% (01:01) wrong based on 84 sessions

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If mn = K, what is the value of K ?

(1) m + n = 2mn
(2) (m+n)^2=m^2+n^2
[Reveal] Spoiler: OA

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4/28 GMATPrep 42Q 36V 640

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Kudos [?]: 73840 [0], given: 9903

Re: If mn = K, what is the value of K ? [#permalink]

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09 May 2012, 02:48
Expert's post
If mn = K, what is the value of K ?

(1) m + n = 2mn. Not sufficient, consider m=n=0 and m=n=1.

(2) (m+n)^2=m^2+n^2 --> m^2+2mn+n^2=m^2+n^2 --> 2mn=0 --> mn=0 --> K=0. Sufficient.

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Re: If mn = K, what is the value of K ?   [#permalink] 09 May 2012, 02:48
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