XY=1

[singhsa]

Is XY=1?

1.) XYX=X
2.) YXY=Y

OA E

[selango]

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