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Source: — Data Sufficiency |
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by liferocks » Wed May 12, 2010 3:32 am
From 1
|x|+|y|=-|y|

now mod of any number can be positive or 0 then |x|+|y|>=0..since |y| cannot be negativeonly value that satisfies the equation is
|x|+|y|=0..sufficient

From 2
same reason as 1

both are sufficient
Ans option D
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