(Solved): Which of the following that are not tautology. (choose all) Please upload your worksheet in the la ...

Which of the following that are not tautology. (choose all) Please upload your worksheet in the last question in this quiz. \[ \begin{array}{l} (p \oplus q) \vee(p \oplus \neg q) \\ (a \rightarrow b) \leftrightarrow(\neg a \rightarrow \neg b) \\ (\neg a \vee b) \leftrightarrow(a \rightarrow b) \\ (a \rightarrow b) \rightarrow(\neg b \rightarrow \neg a) \\ (a \vee b) \vee((\neg a) \wedge(\neg b)) \end{array} \]