3.3 - The Addition Rule
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4 Terms
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Mutually Exclusive Events
Two events, A and B are mutually exclusive when A and B cannot occur at the same time. That is, A and B have no outcomes in common
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The Addition Rule
Considering mutually exclusive events, the probability of both occurring is the sum of the probabilities of each event.
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If A and B are not mutually exclusive events, then
P( A ∪ B) =
(P(A)+ P(B)) - P(A ∩ B)
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If A and B are mutually exclusive events, then
P( A ∪ B) =
P(A) + P(B)
Note 
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