Let E and F be events in a sample space S .

(a) The probability of E or F occurring is P ( E ∪ F ) = _________.

(b) If the events E and F have no outcome in common (that is, the intersection of E and F is empty), then the events are called ___________ ____________. So in drawing a card from a deck, the event E , “getting a heart,” and the event F , “getting a spade,” are ____________ ___________.

(c) If E and F are mutually exclusive, then the probability of E or F is P ( E ∪ F ) = _________.