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Question
Choose the correct alternative:
Which one of the following is incorrect? For any two propositions p and q, we have
Options
¬(p v q) ≡ ¬p ∧ ¬q
¬(p ∧ q) ≡ ¬p v ¬q
¬(p v q) ≡ ¬p v ¬q
¬(¬p) ≡ p
Solution
¬(p v q) ≡ ¬p v ¬q
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