For example, you could add the following items. The way you define a sample space is up to you, as long as you follow the rules, and accept the consequences. The outcomes in a sample space can be grouped into sets containing one or more elements. These sets are called events. An intersection is sometimes called a joint event, since if it occurs, two events will occur jointly.
Joint events have joint probabilities .
The order in which the events will occur might be exactly the opposite of the order that you will learn about them. This is the point of view to adopt to understand Bayes' Theorem . If two events cannot both occur, they are called mutually exclusive. The occurrence of one excludes the occurrence of the other. Three or more events can also be mutually exclusive.