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MCQ (Single Correct Answer)
GATE CSE 2005
Let P, Q and R be three atomic prepositional assertions. Let X denote (P v Q) → R and Y denote (P → R) v (Q → R). Which one of the following is a tautology?(A) X ≡ Y(B) X → Y(C) Y → X(D) ¬ Y → X
