or - indicates union, and - indicates intersection, P (A ∪ B) = P(A) + P(B) - Formula for union of two events without common elemen , A∩B - A intersection B, A∪B - A union B, P (A ∪ B) = P(A) + P(B) - P (A∩B) - Formula for union of two events with common element, P (A ∪ B) - Probability of A union B, P (A∩B) - Probability of A intersection B,

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