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P(B|A) = P(A and B) / P(A)
Probability of B given that A has happened.
P(A|B) = P(A) and P(B|A) = P(B)
Number of outcomes in A and B / Number in A.
It simplifies calculations, P(B|A) = P(B).
It’s the probability of B assuming A has already happened.
Multiply P(B|A) by P(A).
4/7
0.12
P(A and B)=3/20
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