Let p, q, r, and s be propositional variables. Which of the following expressions are NOT correct formulas of propositional logic? Select all that apply. p ¬ ? q ? r p ? (q, r) q ? s ? q q ¬ r
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- q ∨ s ∧ q is incorrect because it has a misplaced conjunction operator. - q − r is incorrect because the minus sign is not a valid operator in propositional logic. Show more…
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