Statement $\quad(P \Rightarrow Q) \wedge(R \Rightarrow Q)$ is logically equivalent to
$( P \vee R ) \Rightarrow Q$
$( P \Rightarrow R ) \wedge( Q \Rightarrow R )$
$( P \Rightarrow R ) \vee( Q \Rightarrow R )$
$(P \wedge R) \Rightarrow Q$
Contrapositive of the statement:
'If a function $f$ is differentiable at $a$, then it is also continuous at $a$', is
The proposition $ \sim \left( {p\,\vee \sim q} \right) \vee \sim \left( {p\, \vee q} \right)$ is logically equivalent to
Negation of $p \wedge (\sim q \vee \sim r)$ is -
Which of the following Boolean expression is a tautology ?
The contrapositive of $(p \vee q) \Rightarrow r$ is