Addition Rule of Probability: Examples
The general formula for the probability of either one of two events, A or B, happening at all is:
P(A or B) = P(A) + P(B) - P(A and B).
If the events A and B are mutually exclusive (that is, cannot happen at the same time), the Addition Rule is simplied to the following:
P(A or B) = P(A) + P(B) since P(A and B) = 0.
Example 1Example 2
Example 3
Last Updated by SAS October 07, 2026, 16:00:54
