If X and Y are two sets and X′ denotes the complement of X, then X ∩ (X ∪ Y)′ is equal to
If X and Y are two sets and X′ denotes the complement of X, then X ∩ (X ∪ Y)′ is equal to
(A) X
(B) Y
(C) φ
(D) X ∩ Y
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