Question: Which one of the following statements is not a tautology?
(1) $(p \vee q) \rightarrow(p \vee(\sim q))$
(2) $(p \wedge q) \rightarrow(\sim p) \vee q$
(3) $p \rightarrow(p \vee q)$
(4) $(p \wedge q) \rightarrow p$
Correct Option: 1
Solution:
By truth table :
