Probability of the complement of an event

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Question: Just as the difference rule gives rise to a formula for the probability of the complement of an event, so the addition and inclusion/exclusion rules give rise to formulas for the probability of the union of mutually disjoint events and for a general union of (not necessarily mutually exclusive) events.

a. Prove that for mutually disjoint events A and B,

P(A ∪ B) = P(A) + P(B).

b. Prove that for any events A and B.

P(A ∪ B) = P(A) + P(B) - P(A ∩ B).

Reference no: EM131573685

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