*61*

Probability that event A does not occur: P(Aâ€™): **0.7**

Probability that event B does not occur: P(Bâ€™): **0.5**

Probability that event A and/or event B occurs P(AâˆªB): **0.65**

Probability that event A and event B both occur P(Aâˆ©B): **0.15**

Probability that either event A or event B occurs, but not both: **0.5**