Translate the following inference to logic notation: For all x, x is an electrician or x is not a police officer. For all x, x is a police officer or x is not an electrician. There is at least one x for which x is not an electrician. Therefore there is at least one x for which x is not a police officer.
forall x: P(x) or ~Q(x). forall x: Q(x) or ~P(x). exists x: ~P(x). Therefore exists x: ~Q(x).