Probability: Part 3. Compound Events - Example of Complementary Events

In this video: COMPLEMENTARY EVENTS <br />- Two events are complementary if exactly one of them must occur. <br />- The probabilities of complementary events sum to 1. <br />- The complement of event E is denoted E'. It is the event when E fails to occur. <br /> <br />For any event E with complementary event E', <br /> P(E) + P(E') = 1 or P(E') = 1 - P(E). <br /> <br />More at http://www.whassom-nachhilfe.com