Computer Science · Mathematical Logic
Which of the following logical expressions is NOT a tautology?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1¬(X ⇒ Y) ⇒ (Y ⇒ X)
- 2(¬P ∧ ¬Q) ⇒ (R ⇒ Q)✓
- 3(P ⇔ Q) ≡ (P ∧ Q) ∨ (¬P ∧ ¬Q)
- 4(P ⇒ Q) ≡ (¬P ∨ Q)
Correct answer
(¬P ∧ ¬Q) ⇒ (R ⇒ Q)
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