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in Discrete Mathematics by (47.1k points)

Which one of the following is incorrect? For any two propositions p and q, we have …

(a) ¬(p ∨ q) ≡ ¬p ∧ ¬q      

(b) ¬(p ∧ q) ≡ ¬p ∨ ¬q

(c) ¬(p ∨ q) ≡ ¬p ∨ ¬q

(d) ¬(¬p) ≡ p

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