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Which one of the following statements is not a tautology ?

1. P → (p ∨ q)
2. (p ∧ q) → (~p) ∨ q
3. (p ∧ q) → p
4. (p ∨ q) → (p) ∨ (∼ q))

Correct answer: (p ∨ q) → (p) ∨ (∼ q))

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