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

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Is |k| = 2? [#permalink]

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


is the answer D correct?. I will verify the answer after i see one of your reply.

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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New post 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..!! :-D :-D

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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New post 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..!! :-D :-D

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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New post 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..!! :-D :-D

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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New post 03 May 2010, 18:30
+1 D

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

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New post 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.
Anyone, have the OA please?

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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New post 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.
Anyone, have the OA please?

Thanks
Cheers!
J:)


Is |k| = 2?

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

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

Answer: D.
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Re: Is |k| = 2? [#permalink]

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Re: Is |k| = 2? [#permalink]

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New post 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.
Therefore, the answer is D.


 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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