Discussion
Which of the following propositions is tautology?
Answer: C
Correct answer: p v (p→q)
Rewrite the implication: \( p \lor (p \to q) \equiv p \lor \lnot p \lor q \), and \( p \lor \lnot p \) is already true, so the whole is true whatever the values. The other candidate reduces to \( p \lor \lnot q \), which fails when p is false and q true, and the first option fails when p is true and q false.
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