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Union of A and B. A ∪ B. ( A or B ) contains all elements that are either in A or in B or both. Axiom 1. Let A be any event defined over S. Then P(A) ≥ 0. ... <看更多>

The statements A∩(A∪B)=A and A∪(A∩B)=A are known as absorption laws. When the proof is not clear using the equivalence "if and only if", ... ... <看更多>