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@jemoka / Jemoka Knowledge Base / raw/concept/kbhsum_rule_of_counting.md
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--- title: "inclusion exclusion counting" source: https://www.jemoka.com/posts/kbhsum_rule_of_counting/ --- If an outcome can be from sets \(A=m\) or \(B=n\) with no overlaps, where \(A \cap B = \emptyset\), then, the total number of outcomes are \(|A| + |B| = m+n\) If there are overlap: \begin{equation} N = |A|+|B| - |A \cap B| \end{equation}