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DS [#permalink] New post 23 Jun 2004, 20:53
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Answer with explaination
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Re: DS [#permalink] New post 24 Jun 2004, 07:49
Bhai wrote:
Answer with explaination


B is the answer:

1 is not suff., since its only implication is that -1 and 1 belong to S.

2 is suff., since -2 and 2 belong to S => -4 belongs to S.
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 [#permalink] New post 24 Jun 2004, 09:41
clearly B (same reasoning as Emmanuel's)
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Re: DS [#permalink] New post 24 Jun 2004, 17:32
Emmanuel wrote:
Bhai wrote:
Answer with explaination


B is the answer:

1 is not suff., since its only implication is that -1 and 1 belong to S.

2 is suff., since -2 and 2 belong to S => -4 belongs to S.


Can you elaborate more on your point. I think I got it but not its not connecting..
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 [#permalink] New post 24 Jun 2004, 20:29
B..

2 in S, this -2 is in S
a=2, b=-2 ---> a*b in S, or -4 in S.
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 [#permalink] New post 25 Jun 2004, 11:58
my anz wud be

E ...
A) not suffiencient... since we know that 1 , -1 ARE THR...

B) not suffcient ... 2 and -2 are there....

combining we do not anything other than 1 -1 2 and -2...

also how can we assume that -a = b batli a=2 acc'' second statmt'' and if a is there we alsp have -a= -2 and if a is there we get b there... true but how and why do we have to assume that b=-a

and how can we multiply 2 and -2 its like -a* a and not ab...
some one help me ...

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  [#permalink] 25 Jun 2004, 11:58
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