(9) Conditional probability

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7 Terms

1
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A and B

A∩B

∩ = Intersection

2
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A or B

A∪B

∪ = Union

3
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Not A

A’

‘ = Complement (of A)

4
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Probability of B given A has already occured

P(B|A)

5
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P(A|B) for independent events

P(A|B’) = P(A) and vice versa for B

6
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P(A∪B)

P(A) + P(B) - P(A∩B)

7
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P(B|A)

P(B∩A) / P(A)

hence P(B∩A) = P(B|A) x P(A)