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"Either/Or" Probability with Venn Diagrams and Two-Way Tables

Author: Katherine Williams

Source: Graphs and tables created by Katherine Williams

Terms to Know

Either/Or Probability for Overlapping Events: The probability that either of two events occurs is equal to the sum of the probabilities of the two events, minus the joint probability of the two events happening together. Also known as the "General Addition Rule".

Formulas to Know

Either/Or Probability for Overlapping Events: $P left parenthesis A space o r space B right parenthesis space equals space P left parenthesis A right parenthesis space plus thin space P left parenthesis B right parenthesis thin space minus space P left parenthesis A space a n d space B right parenthesis$