jee-main 2021 Q67

jee-main · India · session1_24feb_shift1 Proof True/False Justification
The statement among the following that is a tautology is:
(1) $A \vee A \wedge B$
(2) $A \wedge A \vee B$
(3) $B \rightarrow A \wedge A \rightarrow B$
(4) $A \wedge A \rightarrow B \rightarrow B$
The statement among the following that is a tautology is:\\
(1) $A \vee A \wedge B$\\
(2) $A \wedge A \vee B$\\
(3) $B \rightarrow A \wedge A \rightarrow B$\\
(4) $A \wedge A \rightarrow B \rightarrow B$