gagan_g2k wrote:

Is x less than y?

(1) x-y+1<0

(2) x-y-1<0

The official answer is a but as per my solution it should be d.

That's a very easy trap to fall for, I to fell for it.

Added the two inequalities and got x-y <0 and condluded both are necessary

But if you look at x-y +1 < 0 this means that x+y < -1

which means that X-Y < 0 as -1 < 0 , so we can get the answer from one only.

Now looking at 2) X-Y -1< 0 this means that x-y < 1 which doesn,t clearly mean that x<y as something less than 1 can be positive and negative both.

So A is the answer.

Damn i need more practice !