in the If they were unsure of the address, then they would have telephoned. ers a .:. They were sure of the address. Use truth tables to determine whether the argument forms in 6- 11 are valid. Indicate which columns represent the premises and which represent the conclusion, and include a sentence explain- ing how the truth table supports your answer. Your explanation should show that you understand what it means for a form of argument to be valid or invalid. d b umber, 6. 7. P nterior 3600 . ~q p