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XY=1

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Source: — Data Sufficiency |
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by selango » Tue Sep 14, 2010 12:01 pm
xy=1?

stmt1,

XYX=X

XYX-X=0

X(XY-1)=0

x=0 OR xY=1

Insuff

stmt2,

YXY=Y

YXY-Y=0

Y(XY-1)=0

Y=0 or XY=1

Insuff

Combining 1 and 2

We still don't know if xy=1

Pick E
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