First slide

Introduction to mathematical reasoning

Question

Which of the following is true?

Moderate

A

$p \land ~ p \equiv t$
B

$p \lor ~ p \equiv f$
C

$p \to q \equiv q \to p$
D

$p \to q \equiv\sim q \to\sim p$

Solution

$~ q \to\sim p$ is contrapositive of $p \to q$ and both convey the same meaning.

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