**Published on** March 20th, 2013 |
*by What2Learn*

# Tree diagram of conditional probability

A Tree diagram of probability allows you to see all of the possible outcomes of an event and to calculate their probability. In a tree diagram of probability we can calculate the probability of any outcome by multiplying along the branches. If we want to know the probability of more than one outcome we need to add vertically.

In the second of two interactive tree diagrams of probability, you need to calculate the probability of each possible outcome. The activity represents the drawing of different colours of counters from a bag. The two events are **conditional** as the counters are **NOT** returned to the bag after each selection.

Read the instructions at the start of the interactive game carefully as it will tell you exactly how many counters are in the bag each time.

If you are now an expert on independent probability then why not check out our mathematics page for a range of other interactive mathematics games suitable for KS3 and GCSE students.

Even better – sign up for your free account to get full access to the thousands of interactive learning games inside What2Learn. You even get your own virtual farm to develop and care for.

**Related posts:**