GATE | Sudo GATE 2020 Mock II (10 January 2019) | Question 18

Which of the following is not tautology ?
(A) ((p ∧ q) ∧ (q ∧ r)) → (p ∧ r)
(B) ((p ⊕ q) ∧ (q ⊕ r)) → (p ⊕ r)
(C) ((p ∨ q) ∧ (¬p ∨ r)) → (q ∨ r)
(D) ((A ∨ B) → C)) ↔ ((A → C) ∨ (B → C))


Answer: (D)

Explanation: Option (D) ((A ∨ B) → C)) ↔ ((A → C) ∨ (B → C)) is not tautology.

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