MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Step 1
  • The OR rule : 

Sometimes we want to know the probability of getting one result or another. The OR rule can help us here if the two results are mutually exclusive.

Mutually exclusive means that the two outcomes of the same event cannot happen at the same time. The outcome of a football match is an example of something that is mutually exclusive as the match is either won, lost or drawn, it cannot be both won and drawn at the same time.

When events are mutually exclusive and we want to know the probability of getting one event OR another, then we can use the OR rule. 

 
P(A or B) = P(A) + P(B) for mutually exclusive events.   
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