If the Boolean expression $( p \Rightarrow q ) \Leftrightarrow( q *(\sim p ))$ is a tautology, then the Boolean expression $p *(\sim q )$ is equivalent to

The conditional $(p \wedge q) ==> p$ is

$\sim (p \vee q) \vee (~ p \wedge q)$ is logically equivalent to

Which of the following is a tautology?

The negation of $ \sim s \vee \left( { \sim r \wedge s} \right)$ is equivalent to :

$\sim (p \Leftrightarrow q)$ is