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P(B|A) = P(A and B) / P(A)
Probability of B given A has occurred.
P(B|A) = P(A and B) / P(A) = 0.3 / 0.6 = 0.5
It means 'given that' or 'knowing that'.
P(B|A) = P(B)
Outcomes where both A and B occur.
P(A and B) = 0.4 * 0.5 = 0.2
Confusing P(B|A) with P(A|B).
Count outcomes in A and B, divide by outcomes in A.
P(B|A) = P(A and B) / P(A) = 0.1 / 0.2 = 0.5
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