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2 results for “union”

Formulae (2)

P(A \cup B) = P(A) + P(B) - P(A \cap B)

Probability that A or B occurs.

|A\cup B\cup C| = |A|+|B|+|C|-|A\cap B|-|A\cap C|-|B\cap C|+|A\cap B\cap C|

Counts the union of overlapping sets without double counting.