The proposition $\sim (p \vee \sim q) \vee \sim (p \vee q)$ is logically equivalent to

Check whether the following statement is true or not.
If $x, y \in \mathbb{Z}$ are such that $x$ and $y$ are odd,then $xy$ is odd.

The negation of the statement "The triangle is an equilateral or isosceles triangle and the triangle is not isosceles and it is right angled" is

If $x = 5$ and $y = -2$,then what is the contrapositive of the statement $x - 2y = 9$?

The negation of the inverse of the statement $\sim p \lor \sim q$ is...

The Boolean expression $\sim (p \Rightarrow (\sim q))$ is equivalent to