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Manager  Joined: 27 Feb 2010
Posts: 88
Location: Denver
Is |k| = 2?  [#permalink]

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3
6 00:00

Difficulty:   5% (low)

Question Stats: 77% (00:35) correct 23% (00:42) wrong based on 510 sessions

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Is |k| = 2?

(1) k^2 = 4
(2) k = |-2|
Manager  Joined: 27 Feb 2010
Posts: 88
Location: Denver
Re: Is |k| = 2? need help  [#permalink]

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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.

Originally posted by zz0vlb on 28 Apr 2010, 12:33.
Last edited by zz0vlb on 03 May 2010, 19:10, edited 1 time in total.
Manager  Joined: 24 Jul 2009
Posts: 240
Re: Is |k| = 2? need help  [#permalink]

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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.
Manager  Joined: 15 Dec 2009
Posts: 51
Re: Is |k| = 2? need help  [#permalink]

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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
Manager  Joined: 05 Jul 2008
Posts: 130
GMAT 2: 740 Q51 V38 Re: Is |k| = 2? need help  [#permalink]

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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
SVP  Joined: 06 Sep 2013
Posts: 1676
Concentration: Finance
Re: Is |k| = 2? (1) k sqr = 4 (2) k = |-2| I need someone to  [#permalink]

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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:)
Math Expert V
Joined: 02 Sep 2009
Posts: 53831
Re: Is |k| = 2? (1) k sqr = 4 (2) k = |-2| I need someone to  [#permalink]

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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.

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Math Revolution GMAT Instructor V
Joined: 16 Aug 2015
Posts: 7115
GMAT 1: 760 Q51 V42 GPA: 3.82
Re: Is |k| = 2?  [#permalink]

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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]

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zz0vlb wrote:
Is |k| = 2?

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

1. basically tells that |k|=2 - sufficient
2. k=2 -> |k|=2 - sufficient.

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Re: Is |k| = 2?  [#permalink]

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1. K ^2 = 4 => k= +2 or -2 = |k|
2. k= |-2| = > |k| = 2 Suff So D is the answer
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Senior Manager  P
Joined: 17 Mar 2014
Posts: 432
Re: Is |k| = 2?  [#permalink]

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Bunuel wrote:
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.

Hello Bunuel,

I am not getting how option 2 is sufficient. As per question statement- $$|K| =2$$ so K can 2 or -2

Option 2 says K= |-2| =2, it doesn't give option of -2.
Math Expert V
Joined: 02 Sep 2009
Posts: 53831
Re: Is |k| = 2?  [#permalink]

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ammuseeru wrote:
Bunuel wrote:
Is |k| = 2?[/b]

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

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

Hello Bunuel,

I am not getting how option 2 is sufficient. As per question statement- $$|K| =2$$ so K can 2 or -2

Option 2 says K= |-2| =2, it doesn't give option of -2.

The question asks: Is |k| = 2?

(2) says: k = 2. If k = 2, then |k| = 2.
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Location: India
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Re: Is |k| = 2?  [#permalink]

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zz0vlb wrote:
Is |k| = 2?

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

#1:
K^2= +/-2 ; sufficient

#2
k=l-2l= 2
sufficient

IMO D
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