# Conditional Probability

Conditional Probability, probability, tree diagram

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- Created by: Rukiya Majid
- Created on: 13-05-09 14:22

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`Conditional Probability

Recap: Independent events.

If events A and B are independent, then the probability of B happening does not depend upon whether A

has happened or not. Therefore

and

.

A tree diagram can be drawn:

Dependent events:

If A and B are dependent events, the probability of B happening will depend upon whether A has

happened or not.

We therefore have to introduce conditional probabilities in the tree diagram (as shown below):

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