If P(A or B)= 1,then A and B must be mutually exclusive.

Name: If P(A or B)= 1,then A and B must be mutually exclusive.
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Quizplus · Accepted Answer

P(A or B) = 1 means that the probability of either event A or event B occurring is certain, but it does not imply that A and B are mutually exclusive. Mutually exclusive means that A and B cannot happen at the same time, which is not a requirement for their combined probability to be 1.

If P(A or B)= 1,then a and B Must Be