Question

 Explain use of the inclusion-exclusion principle with an example.

18 Dec 2025
Answer :
Word Count : 155
The inclusion-exclusion principle is a fundamental concept in discrete mathematics used to count the number of elements in the union of overlapping sets. It helps avoid overcounting elements that belong to multiple sets. For two sets (A) and (B), the principle states (|A \cup B| = |A| + |B| - |A \cap B|). This formula subtracts the intersection because
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