Conditional Probability

Conditional Probability

The conditional probability of event E given event F, written P(E│F) , is

P(E│F) = \frac{P(E\cap F) }{P( F)}, where P(F) ≠ 0.


This definition tells us that, for equally likely outcomes, conditional probability

is found by reducing the sample space to event F, and then finding the number of

outcomes in F that are also in event E.


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