vinnik wrote:

If Z is an integer, what is the value of Z ?

1. Z^2 <= 0

2. Z^3 <= 0

I thought that if i can solve from (1), then i can also solve from (2). So, I selected D which is incorrect.

Please help me in understanding why we cannot solve from (2).

Thanks & Regards

Vinni

In STAT1 its sufficient because minimum value of square of a number is 0(if the number itself is zero). Square of any number will always be greater than or equal to zero. So, only possible value if z which satisfies both z>=0 and z<=0 is z=0 so. It's sufficient.

STAT2: since its z^3 <= 0 then z can be 0 or any negative value as cube of negative number is negative. So we have infinitely many solutions to this.

So, answer wil be A

Hope it helps!

_________________

Ankit

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