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Source: — Data Sufficiency |
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by welcome » Tue Jan 13, 2009 7:10 am
|X| = 1-Y means..
1) if X is +ve => x=1-Y => X+Y=1
2) if X is -ve then X=Y-1 => X-Y=-1


A) X+Y=1, true for +ve X, false for -ve. NOT SUFF
B) X<0 , nit enough info, NOT SUFF

c) X<0 and X+Y=1 => niether 1) nor 2) is true. given statement is not true.

Ans : C
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by maihuna » Fri Jan 16, 2009 7:31 am
let me try:

if x<0 and x+y=1 then only thing we know is what?

if x=-1, y=2 so y+1 = 3 and |x| != y+1
x=-.5, y=1.5 so again |x| != y+1

and it will never be..


y = -1.5, x = -0.5
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