Select all true statements. The statement p V [-p ^ q)] is a tautology.
The statement (p V q) (q^ns) is logically equivalent
to (-9 V s) — (p^-9)
If (P1 AP2 P3) — q is a valid argument, then so is
(P1 AP2 AP3 A24) - q for any statement P4.
In the statement "If you are good at logic, then you can answer
this question correctly", being good at logic is a necessary
condition for answering this question correctly.