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Which of the following are tautology?A. (p \lor r) \rightarrow pB. p \rightarrow (p \land r)C. \sim p \rightarrow (p \rightarrow r)D. (p \land r) \rightarrow (p \rightarrow r)E. \sim(p \rightarrow r) \rightarrow p | Watch the step-by-step video solution for this NIMCET PYQ.