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

Redeem

Numbers Set - Answer contridicts - Need expert advise please

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |

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 » Sat Jun 23, 2012 10:07 pm
Statement 1: As 2 is in k, -2 is in K.
Hence, (2)*(-2) = -4 is in K
We can see that extending the logic all the integers which are multiple of 2 only will be in K. But 12 contains a 3, which is not possible to include from this statement.

Not sufficient

Statement 2: Same logic as of statement 1.

Not sufficient

1 & 2 Together: As 2 and 3 are in K, 2*3 = 6 is in K.
As 2 and 6 are in K, 2*6 = 12 is in K.

Sufficient

The correct answer is C.
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
Senior | Next Rank: 100 Posts
Posts: 90
Joined: Wed Mar 21, 2012 1:27 am
Thanked: 5 times
Followed by:2 members

by sandeep_thaparianz » Sun Jun 24, 2012 4:09 am
Agree with C
Top
Junior | Next Rank: 30 Posts
Posts: 27
Joined: Tue Sep 21, 2010 7:38 am
Thanked: 4 times

by svd.kumar » Sun Jun 24, 2012 6:28 am
Thanks Anurag,

My point here is

Option 1 alone is sufficeient to tell whether 12 is in Set K or not right? All intengers which are multiples of 2 only in set, so 12 is not in Set K.

Similarly for Option 2 alone is sufficent to tell that all integers which are multiples of 3 only in set, so 12 is not in set K.

Why can't answer be D, with both statements alone are sufficent.
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 » Sun Jun 24, 2012 6:31 am
"2 is in K" doesn't mean only 2 is in K. 3 or 6 or 12 or etc may be in K.

Hope that helps.
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