Is |k| = 2? : GMAT Data Sufficiency (DS)
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Is |k| = 2?

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28 Apr 2010, 11:30
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Is |k| = 2?

(1) k^2 = 4
(2) k = |-2|
[Reveal] Spoiler: OA
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Re: Is |k| = 2? need help [#permalink]

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28 Apr 2010, 11:33
1. K sqr = 4 => k= +2 or -2 = |k| ??? Suff ?
2. k= |-2| = > |k| = 2 ?? Suff ?

Last edited by zz0vlb on 03 May 2010, 18:10, edited 1 time in total.
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Re: Is |k| = 2? need help [#permalink]

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28 Apr 2010, 11:38
zz0vlb wrote:
Is |k| = 2?

(1) k sqr = 4
(2) k = |-2|

I need someone to explain me the concept of this problem. I am not fully confident. Gurpreet or Bunuel?

I'm not gurpreet or Bunuel, but still would like to try..!!

Question asks Is |k| = 2 >>> which means >>> Is k= 2,-2.
If the value of k is 2 or -2, the answer will "YES"

Statement 1:
k sqr = 4 means >>> k =2 or k=-2, In either case |k| = 2.

Statement 2:
k = |-2| = 2.
so k =2, so |k| = 2.

IMO its D.
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Re: Is |k| = 2? need help [#permalink]

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29 Apr 2010, 07:44
nverma wrote:
zz0vlb wrote:
Is |k| = 2?

(1) k sqr = 4
(2) k = |-2|

I need someone to explain me the concept of this problem. I am not fully confident. Gurpreet or Bunuel?

I'm not gurpreet or Bunuel, but still would like to try..!!

Question asks Is |k| = 2 >>> which means >>> Is k= 2,-2.
If the value of k is 2 or -2, the answer will "YES"

Statement 1:
k sqr = 4 means >>> k =2 or k=-2, In either case |k| = 2.

Statement 2:
k = |-2| = 2.
so k =2, so |k| = 2.

IMO its D.

Statement 1:
k sqr = 4 means >>> k =2 or k=-2, Also k can be Root 4

NOT SUFF

Statement 2:
k = |-2| = 2.
so k =2, so |k| = 2.

SUFF

IMO B
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Re: Is |k| = 2? need help [#permalink]

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30 Apr 2010, 08:01
chauhan2011 wrote:
nverma wrote:
zz0vlb wrote:
Is |k| = 2?

(1) k sqr = 4
(2) k = |-2|

I need someone to explain me the concept of this problem. I am not fully confident. Gurpreet or Bunuel?

I'm not gurpreet or Bunuel, but still would like to try..!!

Question asks Is |k| = 2 >>> which means >>> Is k= 2,-2.
If the value of k is 2 or -2, the answer will "YES"

Statement 1:
k sqr = 4 means >>> k =2 or k=-2, In either case |k| = 2.

Statement 2:
k = |-2| = 2.
so k =2, so |k| = 2.

IMO its D.

Statement 1:
k sqr = 4 means >>> k =2 or k=-2, Also k can be Root 4

NOT SUFF

Statement 2:
k = |-2| = 2.
so k =2, so |k| = 2.

SUFF

IMO B

D for sure. The question is about |k|, root 4 =2. k=2 or -2 <=> k square=4 <=> |k|=2

ksquare=4 doesn't mean k can be root 4
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Re: Is |k| = 2? need help [#permalink]

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03 May 2010, 18:30
+1 D

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Re: Is |k| = 2? (1) k sqr = 4 (2) k = |-2| I need someone to [#permalink]

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16 Oct 2013, 04:26
zz0vlb wrote:
Is |k| = 2?

(1) k sqr = 4
(2) k = |-2|

I need someone to explain me the concept of this problem. I am not fully confident. Gurpreet or Bunuel?

Hey Guys - Going with D on this one.

Thanks
Cheers!
J:)
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Re: Is |k| = 2? (1) k sqr = 4 (2) k = |-2| I need someone to [#permalink]

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16 Oct 2013, 05:52
jlgdr wrote:
zz0vlb wrote:
Is |k| = 2?

(1) k sqr = 4
(2) k = |-2|

I need someone to explain me the concept of this problem. I am not fully confident. Gurpreet or Bunuel?

Hey Guys - Going with D on this one.

Thanks
Cheers!
J:)

Is |k| = 2?

(1) k^2 = 4 --> |k| = 2. Sufficient.

(2) k = |-2| --> k=2 --> |k| = 2. Sufficient.

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Re: Is |k| = 2? [#permalink]

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30 Jan 2016, 08:05
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Re: Is |k| = 2? [#permalink]

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31 Jan 2016, 21:13
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.

Is |k| = 2?

(1) k^2 = 4
(2) k = |-2|

In the original condition, there is 1 variable(k), which should match with the number of equations. So you need 1 equation.
For 1) 1 equation, for 2) 1 equation, which is likely to make D the answer.
For 1), k=-2,2 but |k|=|2|,|-2|=2, which is unique and sufficient.
For 2), k=|-2|=2, which is unique and sufficient.

 For cases where we need 1 more equation, such as original conditions with “1 variable”, or “2 variables and 1 equation”, or “3 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 59 % chance that D is the answer, while A or B has 38% chance and C or E has 3% chance. Since D is most likely to be the answer using 1) and 2) separately according to DS definition. Obviously there may be cases where the answer is A, B, C or E.
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Re: Is |k| = 2?   [#permalink] 31 Jan 2016, 21:13
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