s the following argument valid or invalid?

Justify your answer as follows.

To justify validity you can supply a truth table for all variables involved. Have columns for the premises and the conclusion. Argue whether the argument is valid based on the truth table. You can also justify validity by giving a proof where you list a reason for each of its steps. Such a reason would consist of a logical equivalence or a rule of inference as well as line numbers of previous statements used in the step.

To justify invalidity give a counter example to the argument.

q(pr)

pq

p

r