Negation of the statement "The payment will be made if and only if the work is finished in time." is

The inverse of $p \rightarrow(q \rightarrow r)$ is logically equivalent to

If $\mathrm{p} \rightarrow(\sim \mathrm{p} \vee \sim \mathrm{q})$ is false, then the truth values of p and q are respectively

Negation of the statement ' Horses have wings if and only if crows have tails. ' is