Probability Axioms - More Consequences

More Consequences

Another important property is:

This is called the addition law of probability, or the sum rule. That is, the probability that A or B will happen is the sum of the probabilities that A will happen and that B will happen, minus the probability that both A and B will happen. This can be extended to the inclusion-exclusion principle.

That is, the probability that any event will not happen is 1 minus the probability that it will.

Read more about this topic:  Probability Axioms

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