1. Using only the rules of inference and the logical equivalences listed on the last page of this quiz, show that the following argument is a contradiction by reducing it to a value of "False". You may assume that all the premises given are true. Make sure that you include both the rule and the line number(s) to which that rule is applied. [7 marks] ab -b nad d ne enf 2. Using only the rules of inference and the logical equivalences listed on the last page of this quiz, show that the following argument is valid. You may assume that all the premises given are true. Make sure that you include both the rule and the line number(s) to which that rule is applied. [9 marks) 1) Vx A(x) + B(x) 2) Vx (B(x) V C(x)) - D(x) 3) VX D(x) v E(x) 4) 3x A(x) A F(x) 3x E(x) A F(x)