# conditional probability

Definition from Wiktionary, the free dictionary

## Contents

## English[edit]

### Noun[edit]

**conditional probability** (*plural* **conditional probabilities**)

- The probability that an event will take place given the restrictive assumption that another event has taken place, or that a combination of other events has taken place. (Mathematically, the definition would be that the
**conditional probability**of*B*given*A*is equal to the joint probability of*A*and*B*divided by the probability of*A*.)

#### Usage notes[edit]

- The "probability of event
*B*given event*A*" can be represented symbolically as . - The "probability of event
*B*given events*A*and*C*" can be represented symbolically as .