Quant - datasuffiency

[Nareshkumar j]

Q) IF ab#0 and the points (-a b) and (-b a) are in the same Quadrant
in the XY plane. Is point (-X,Y) is in the same quadrant?

A) XY >0
B) AX>0

[Kripa Tewari]

If ab #0 then the points have to be in one of the quadrant and not on origin or any axis line.

 

now (-a,b) and (-b,a) will be in same quadrant only when a=b.

 

So points are (-a,a) or (-b,b) so one of them will be of poosite sign. as we don't know about if a > or a<0 so two posibilities:

 

2nd or 4th quadrant.

 

Now let us check the choices :

A) XY>0 this means both positive or both negative. so no chance it would be in same quadrant(2nd or 4th). SO we can answer no. Hence A is sufficient.

B) AX>0 this does not give any info of Y and A is new variable. So not siffiient.

 

Answer should be A.

 

Please confirm or correct.

 

Regards

Kripa

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[Nareshkumar j]

OA is "C"