formal logic

Show that the following argument is valid by giving an informal proof, phrased in complete, well-formed English sentences Use proof by cases and/or proof by contradiction. Toon aan dat dve volgende argument geldrg ("vald") is deur ' n informele bewys te gee wat bestaan uit goedgeformuleerde Engelse of Afrikaanse smne Gebruik bewys deur gevalle ("proof by cases") en/of bewys deur teenstelling ("proof by contradiction") Harry and Moses belong to the Pink Giraffe soccer club If Moses is chosen for a match, the coach always lets him play for the first 60 minutes If both Moses and Harry are chosen, Harry does not start the match but the coach lets Harry replace Moses when Moses leaves the field 4 If Harry is chosen but Moses not, the coach always lets Harry start the match and then replaces him after 50 munutes 5 Harry is chosen for the match The Guraffes shoot their only goal after 55 minutes of play Harry did not shoot the goal