If mn = K, what is the value of K ? : GMAT Data Sufficiency (DS)
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# If mn = K, what is the value of K ?

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

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09 May 2012, 01:41
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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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Kudos [?]: 93399 [0], given: 10557

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

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09 May 2012, 01:48
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, 01:48
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