First slide

Introduction to mathematical reasoning

Question

The only statement among the following that is a tautology is

Moderate

A

$B \to [A \land (A \to B)]$
B

$A \land (A \lor B)$
C

$A \lor (A \land B)$
D

$[A \land (A \to B)] \to B$

Solution

The truth value of all the elements of the column $A \land (A \to B) \to B ∴ A \land (A \to B) \to B$ is a tautology

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