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The conditional probability formula is P(X │ Y) = StartFraction P (X intersection Y) Over P (Y) EndFraction.
The conditional probabilities P(D │ N) and P(N │ D) are equal for any events D and N.
The notation P(R │ S) indicates the probability of event R, given that event S has already occurred.
Conditional probability applies only to independent events.
Conditional probabilities can be calculated using a Venn diagram.