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by Rahul@gurome » Tue Sep 14, 2010 3:56 am
XY+Z = X(Y+Z) implies XY + Z = XY + XZ
Z = XZ
Z - XZ = 0
Z(1 - X) = 0
Therefore, X = 1 and Z = 0.

The correct answer is [spoiler](E)[/spoiler].
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