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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, 02:41
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Difficulty:

15% (low)

Question Stats:

78% (01:15) correct 22% (01:40) wrong based on 117 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

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

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09 May 2012, 02:48
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]

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27 Dec 2017, 06:31
mn = K, find value of K
Stmt 1: m+n = 2mn (3 variables 2 equations - multiple solutions possible)
Stmt 2: on solving you get mn=0 => K=0 (thus sufficient)
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Re: If mn = K, what is the value of K ?  [#permalink]

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04 Jun 2019, 09:22
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Re: If mn = K, what is the value of K ?   [#permalink] 04 Jun 2019, 09:22
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