GATE Computer Science (CS) 2014 Shift 2 Solved Paper

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Question : 63 of 65

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Which one of the following Boolean expressions is NOT a tautology?

((a → b) ∧ (b → c)) → (a → c)
(a ↔ c) → (∼ b → (a ∧ c))
(a ∧ b ∧ c) → (c ∨ a)
a → (b → a)

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