
Concept explainers
To describe why the sum of probabilities of mutually exclusive events is not always one.

Explanation of Solution
Two events can be mutually exclusive if there is no common outcome of the both events. Whereas if there is any common outcome then the events becomes not mutually exclusive events.
When the two events have nothing in common they may have sum of probabilities different than 1.
Sum of probability is one when the favorable outcomes are equal to total outcomes.
But when mutually exclusive events are given it is not necessary that their favorable outcomes become equal to total outcomes.
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