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Master | Next Rank: 500 Posts
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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
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Source: — Data Sufficiency |
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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
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by naaga » Sat Feb 14, 2009 1:20 pm
ok ok I got it

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

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

Regards,
CR
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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
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