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# Is a^2*b > 0? 1) |a|=b 2) ab<0

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Manager
Joined: 07 May 2007
Posts: 181
Followers: 2

Kudos [?]: 18 [0], given: 0

Is a^2*b > 0? 1) |a|=b 2) ab<0 [#permalink]  17 Jun 2007, 20:58
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Is a^2*b > 0?
1) |a|=b
2) ab<0
Senior Manager
Joined: 04 Jun 2007
Posts: 348
Followers: 1

Kudos [?]: 15 [0], given: 0

stmt 1: |a| = b => b >= 0. INSUFFICIENT as we cannot say if a^2*b >0, it can be equal to 0.

stmt 2: ab<0. INSUFFICIENT.

Either a<0 or b<0. If a<0 a^2*b >0 and if b<0, a^2*b <0.
combining stmt 1 and 2. b>0 and a<0.
Since, a^2 >0, a^2*b > 0. SUFFICIENT.

OA?

Last edited by sumande on 18 Jun 2007, 01:33, edited 1 time in total.
Senior Manager
Joined: 04 Mar 2007
Posts: 442
Followers: 1

Kudos [?]: 17 [0], given: 0

if abs(a)=b then b is always >0
Answer would be A if a and b were not 0
But we never know
So (1) is not suff
(2) is not suff neither

Therefore C
Director
Joined: 14 Jan 2007
Posts: 780
Followers: 2

Kudos [?]: 71 [0], given: 0

Nothing much is left after CAAS's explanation. My answer is 'C'.
Manager
Joined: 07 May 2007
Posts: 181
Followers: 2

Kudos [?]: 18 [0], given: 0

You all got it right

This is one of those 'Don't forget zero' traps
Intern
Joined: 03 Aug 2006
Posts: 23
Followers: 0

Kudos [?]: 0 [0], given: 0

I did forget that the nos. could equal zero. Keep making these stupid stupid mistakes....
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