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5. (15 pt.) Use the laws of propositional logic to prove that the following compound propositions are tautologies. a. (5 pt.) (p p Vq)) -4

5. (15 pt.) Use the laws of propositional logic to prove that the following compound propositions are tautologies. a. (5 pt.) (p p Vq)) -4 b. (10 pt.) ((p - )^(9+r)) - ( p r )

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