Part 2. Determine whether each argument is valid. If the argument is valid, give a proof using the laws of logic. If the argument is invalid, give values for the pred- icates P and Q over the domain a, b that demonstrate the argument is invalid. (a) (b) 3x (P(x) ^ Q(x)) ..Er Q(x)^3x P(x) Vx (P(x) V Q(x)) VrQ(x)\\ P(x)

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