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The contrapositive of p → q is the proposition of ____________

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The contrapositive of p → q is the proposition of ____________

(a) ¬p → ¬q

(b) ¬q → ¬p

(c) q → p

(d) ¬q → p

This question was posed to me in final exam.

I'd like to ask this question from Logics topic in portion The Foundation: Logics and Proofs of Discrete Mathematics

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Correct answer is (b) ¬q → ¬p

Easiest explanation: Definition of contrapositive.

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