1 min read•june 11, 2020

Kanya Shah

A and B are **independent events** if knowing whether or not one event has occurred doesn’t change the probability that the other event will happen. In other words, events A and B are independent if P(A | B)=P(A | BC)=P(A). Alternatively, events A and B are independent if P(B | A) = P(B | AC)=P(B). *If the events are independent, then the multiplication rule becomes* P(A and B) =P(A)*P(B).

The event “A or B” is known as the **union **of A and B, denoted by AB. It consists of all outcomes in event A, B, or both.

The **general addition rule **states that if A and B are any two events resulting from some chance process, then P(A or B)=P(A)+P(B)-P(A and B).

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