BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

gmat prep 2

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
GMAT Instructor
Posts: 905
Joined: Sun Sep 12, 2010 1:38 am
Thanked: 378 times
Followed by:123 members
GMAT Score:760

by Geva@EconomistGMAT » Mon Jul 25, 2011 11:14 pm
jainrahul1985 wrote:Is |k | = 2 ?
(1) k^2 = 4
(2) k = |-2|

OA D
If k^2=4, then k equals 2 or -2. Note that the question asked whether |k| equals 2:

If k=2, then |2| is equal to 2 and the answer is yes.
If k=-2, then |-2| is also equal to 2, and the answer is still yes.

Stat. (1) is therefore sufficient to answer the question ("YES").

Stat. (2): the absolute value of -2 is equal to 2, so stat. (2) basically says that k=2--> which means that |k| is equal to 2 as well, and the answer to the question stem is "yes" again. Sufficient. The answer is D.
Geva
Senior Instructor
Master GMAT
1-888-780-GMAT
https://www.mastergmat.com
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Mon Jul 25, 2011 11:21 pm
jainrahul1985 wrote:Is |k | = 2 ?
(1) k^2 = 4
(2) k = |-2|

OA D
(1) k² = 4 implies k = 2 or -2.
When k = 2, |k| = 2
When k = -2, |k| = |-2| = 2, which means that the value of |k| = 2 for both values of k; SUFFICIENT.

(2) k = |-2| implies k = 2
So, |k| = 2; SUFFICIENT.

The correct answer is D.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Post new topic Post Reply
• Page 1 of 1