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Mathematical Logic and Set Theory

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Multiple Choice

Which of the following is a tautology in propositional logic?

  1. ¬(P ∨ Q)
  2. (P → Q) → ¬P
  3. P ∨ (¬P ∧ Q)
  4. ¬(P ∧ Q) → (¬P ∨ ¬Q)
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