Stats 3.3: Addition Rule

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Last updated 2:37 AM on 10/9/26
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4 Terms

1
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Mutually Exclusiveness

mutually exclusive

2 events can NOT occur at the same time → NO common outcomes

  • Ex: draw a King & a Queen


2
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Mutually Exclusiveness

NOT mutually exclusive

2 events CAN occur at the same time

  • Ex: draw a King & a red


3
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Addition (OR) Rule

of mutually exclusive events

P(A ∪ B) = P(A) + P(B)

4
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Addition (OR) Rule

of NOT mutually exclusive events (can happen tg)

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

= [OR rule] - [AND rule]