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When to proof P→Q true, we proof P false, that type of proof is known as ___________

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When to proof P→Q true, we proof P false, that type of proof is known as ___________

(a) Direct proof

(b) Contrapositive proofs

(c) Vacuous proof

(d) Mathematical Induction

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Enquiry is from Types of Proofs topic in portion The Foundation: Logics and Proofs of Discrete Mathematics

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Right answer is (c) Vacuous proof

Explanation: Definition of vacuous proof.

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