Proof of duality law of probability theory

1 and (A∪B∪C∪D) indicate that at least one event occurs in A, B, C and D, and its complement is that none of the events occurs in A, B, C and D, so (A ∪ b ∪ c ∪.

2、a 1∩A2∩A3 =(a 1∩A2)∩A3 =φ∩A3 =φ

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