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If q is false and p ∧ q ↔ r is true, then which one of the following statements is a tautology ?

1. p ∧ r
2. (p ∨ r) → (p ∧ r)
3. p ∨ r
4. (p ∧ r) → (p ∨ r)

Correct answer: (p ∧ r) → (p ∨ r)

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