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 !
close
64% (00:57) correct 
