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

Redeem

sets

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 129
Joined: Mon Dec 15, 2008 11:43 pm
Location: Hyderabad
Thanked: 2 times

sets

by naaga » Sat Feb 14, 2009 12:46 pm
S is a set of integers such that
i) if a is in S, then –a is in S, and
ii) if each of a and b is in S, then ab is in S.
Is –4 in S?
(1) 1 is in S.
(2) 2 is in S.


help anyone with explanation..

thanks in advance
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Sat Feb 14, 2009 1:09 pm
I would go wiht B

Stmt I

1 is in S. Therefore by i) -1 is in S and by ii) agian 1*-1 i.e -1 is in S

No ways to predict if -4 is in S or not

INSUFF

Stmt II

2 is in S

By i) -2 is in S and by ii) 2 * -2 = -4 is in S

SUFF
Top
Master | Next Rank: 500 Posts
Posts: 129
Joined: Mon Dec 15, 2008 11:43 pm
Location: Hyderabad
Thanked: 2 times

by naaga » Sat Feb 14, 2009 1:20 pm
ok ok I got it

here a and b means ( a * -a) write ?

thankyou cramya..
Top
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Sat Feb 14, 2009 1:22 pm
No problem, Naga! Wish u the very best in your prep.

Regards,
CR
Top
Junior | Next Rank: 30 Posts
Posts: 25
Joined: Fri Jan 23, 2009 11:57 am
Location: Minneapolis
Thanked: 1 times

by peddisetty » Sun Feb 15, 2009 12:37 pm
We can clearly tell -4 is not in the set. So the first choice is sufficient.

So the Answer would be D. Please clarify cramya.

Thanks,
Raj.
Raj Peddisetty
Top
Post new topic Post Reply
• Page 1 of 1