When do I use P(A|B) = P(A∩B)/P(B) in Probability, and what does it mean?
conditional probability.
P(A|B) = P(A∩B)/P(B) — conditional probability. Use it when: P(B) > 0. Always check the condition holds before plugging in numbers.
Key point
P(A|B) = P(A∩B)/P(B)
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