The Union of Events: A Marriage Made in Heaven
The union of Events A and B represents all the instances where either Event A or Event B or both occur and is denoted as A ∪ B. Using our previous example, the following table shows the four combinations that include either a call from Christin or a crisis phone call.
Therefore, the probability that the next phone call is either from Christin or is a crisis is as follows:
The union of Events A and B represents the number of instances where either Event A or B occur (that is, ...