The Boolean expression X (X + Y) is same as
\(X(X + Y) = X \cdot X + XY = X + XY = X(1 + Y) = X \cdot 1 = X\)
So \(X(X+Y)\), \(X(1+Y)\), \(X \cdot 1\) and \(X\) are all equal.
Answer: (D) All of these
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