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Inclusion-Exclusion Principle

 
Sci-Tech Dictionary: inclusion-exclusion principle
(¦in′klü·zhən ′eks′klü·zhən ′prin·sə·pəl)

(mathematics) The principle that, if A and B are finite sets, the number of elements in the union of A and B can be obtained by adding the number of elements in A to the number of elements in B, and then subtracting from this sum the number of elements in the intersection of A and B.


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