Method not stated.
Truth table method:
(p → q) → r / ~p V q // r V q
T T T T T FT T T T T T
T T T F F FT T T F T T
T F F T T FT F F T T F <-- NOT VALID!!!
T F F T F FT F F F F F
F T T T T TF T T T T T
F T T F F TF T T F T T
F T F T T TF T F T T F
F T F F F TF T F F F F <-- NOT VALID!!!
Edwn