Let $p , q , r$ be three logical statements. Consider the compound statements $S _{1}:((\sim p ) \vee q ) \vee((\sim p ) \vee r ) \text { and }$ and $S _{2}: p \rightarrow( q \vee r )$ Then, which of the following is NOT true$?$
If $S_{2}$ is True, then $S_{1}$ is True
If $S_{2}$ is False, then $S_{1}$ is False
If $S_{2}$ is False, then $S_{1}$ is True
If $S_{1}$ is False, then $S_{2}$ is False
The statement $p → (p \leftrightarrow q)$ is logically equivalent to :-
The negation of the statement
"If I become a teacher, then I will open a school", is
Let $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ be four non-empty sets. The contrapositive statement of "If $\mathrm{A} \subseteq \mathrm{B}$ and $\mathrm{B} \subseteq \mathrm{D},$ then $\mathrm{A} \subseteq \mathrm{C}^{\prime \prime}$ is
The contrapositive of the statement "if I am not feeling well, then I will go to the doctor" is