Given the following arguments, determine if they are valid or invalid. You may use either the shorten method/partial truth table method, or a complete truth table. If the argument is invalid, please provide the interpretation that shows it is invalid. (5 points each)

Section 1: Semantics Given the following arguments, determine if they are valid or invalid. You may use either the shorten method/partial truth table method, or a complete truth table. If the argument is invalid, please provide the interpretation that shows it is invalid. (5 points each) 2. A& B. (A v B) v C Section 2: Proof Theory (syntax) Please prove that each sequent is equivalent by giving two proofs; one from left to right and another from right to left. That's 6 proofs in total. (25 pts for each problem set)