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x - y + 1 greater than x + y - 1

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Source: — Data Sufficiency |
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by blackarrow » Fri Apr 10, 2009 6:44 pm
From question stem

x-y+1>x+y-1

cancel x

-2y>-2

y<1

thus if we can prove that y<1 , we can prove the inequality

statement 1

x>0... insufficient. we have no knowledge of y

statement 2

y<0...sufficient. because if y<0 it is obv <1

sufficient

IMO B
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by vittalgmat » Fri Apr 10, 2009 7:44 pm
Excellent explanation blackarrow.
B for me as well...
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