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1. Let p, q, r, and s be propositional variables. Which of the following expressions would not be correct formulas of propositional logic? Why? (a)

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1. Let p, q, r, and s be propositional variables. Which of the following expressions would not be correct formulas of propositional logic? Why? (a) p VpV p (b) pqAr (e) ppAq (f) p^qp (g) p -q (j) pqres

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