Lecture 3 Complementary Events. The additive Law of Probability
Definition 3.1
The union of two events A and B is the event that occurs if either A or B or both occur on a single performance of the experiment. We denote the union of events A and B by the symbol . consists of all the sample points that belong to A or B or both.
Figure. Venn diagram showing disjoint events A and B (несовместные [взаимоисключающие] события).
Definition 3.2
The intersection of two events A and B is the event that occurs if both A and B occur on a single performance of the experiment. We denote the intersection of events A and B by the symbol . consists of all the sample points that belong to A and B.
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