# Which one of the following is a tautology?

Question:

Which one of the following is a tautology?

1. (1) $(p \wedge(p \rightarrow q)) \rightarrow q$

2. (2) $q \rightarrow(p \wedge(p \rightarrow q))$

3. (3) $p \wedge(p \vee q)$

4. (4) $p \vee(p \wedge q)$

Correct Option: 1

Solution: