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# DS: positive (tricky one)

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Manager
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17 Sep 2007, 01:50
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Senior Manager
Joined: 13 Mar 2007
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Location: Russia, Moscow
Re: DS: positive (tricky one) [#permalink]

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17 Sep 2007, 02:18

I think it is E

(A) x^2>0, x can be >0 or <0=>insufficient
(B) x*|y| <=0, x can be any number while y=0 =>insufficient

Combination of A and B does not clarify the matter, because A does not influence on B

Last edited by Vlad77 on 17 Sep 2007, 02:22, edited 5 times in total.

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17 Sep 2007, 02:18
St1:
Insufficient. square of anything is always positive (except square of 0)

St2:
x.|y| != positive.

|y| is always positive, so x must be negative. Sufficient.

Ans B

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Manager
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17 Sep 2007, 02:28
ywilfred wrote:
St1:
Insufficient. square of anything is always positive (except square of 0)

St2:
x.|y| != positive.

|y| is always positive, so x must be negative. Sufficient.

Ans B

Got it!

We missed the possibility that y can be zero too so B is not enough.

Thanks

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17 Sep 2007, 02:28
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