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(1.3 Propositional Equivalence) Which of the following is a tautology? a. (p q) + (-+ p) b. [(p+q) r] + [p (q + r)] C.

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(1.3 Propositional Equivalence) Which of the following is a tautology? a. (p q) + (-+ p) b. [(p+q) r] + [p (q + r)] C. [(pq) r] - [(p+r)^(q + r)] d. (p) (p)

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