Translate the following inference to logic notation: For all x, if x_1 were an electrician, then x_1 is playing tennis. For all x, if x_1 plays tennis, then x_1 is an electrician. Therefore for all x, if x_1 plays tennis, then x_1 is an electrician.
forall x: P(x) -> Q(x). forall x: Q(x) -> P(x). Therefore forall x: Q(x) -> P(x).