The negation of the compound proposition $p \vee (\sim p \vee q)$ is

Write the negation of the following statement:
All triangles are not equilateral triangles.

The negation of the contrapositive of the statement $(p \lor \sim q) \to (p \land \sim q)$ is

If $p$ and $q$ are true statements and $r$ is a false statement,then which of the following is correct?

For any three simple statements $p, q, r$,the statement $(p \wedge q) \vee (q \wedge r)$ is true if and only if:

Consider the following statements:
$p$: If voltage increases, then current decreases.
$q$: If voltage does not increase, then current does not decrease.
$r$: If current decreases, then voltage increases.
$s$: If current does not decrease, then voltage does not increase.
Which of the following pairs of statements have the same meaning?