Principle of Inclusion-Exclusion

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The Principle of Inclusion-Exclusion (abbreviated PIE) provides an organized method/formula to find the number of elements in the union of a given group of sets, the size of each set, and the size of all possible intersections among the sets.


2002 AIME I Problems/Problem 1

2011 AMC 8 Problems/Problem 6

2017 AMC 10B Problems/Problem 13

2005 AMC 12A Problems/Problem 18

See also

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