A union of two events, β€œπ΄ π‘œπ‘Ÿ 𝐡,” includes all elements in both events notated by: 𝐴 βˆͺ 𝐡. Addition Rule for mutually exclusive events: If 𝐴 and 𝐡 are mutually exclusive, 𝑃(𝐴 π‘œπ‘Ÿ 𝐡) = 𝑃(𝐴) + 𝑃(𝐡).

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