The sum of all the probabilities for the simple events in the sample space must be equal to 1.

Name: The sum of all the probabilities for the simple events in the sample space must be equal to 1.
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In probability theory, the sum of the probabilities of all simple events in a sample space equals 1, because the sample space represents the total set of possible outcomes, and there is a 100% chance that one of the outcomes will occur.

The Sum of All the Probabilities for the Simple Events