**Tree Diagram**

Used in probability to show all of the

possible outcomes or combinations of an event.

A box has 1 red ball, 1 green ball

and 1 blue ball, 2 balls are drawn

from the box one after the other,

without replacing the first ball

drawn. Use the tree diagram to

find the number of possible

outcomes for the experiment.

The possible outcomes are RG, RB,

GR, GB, BG and BR.

So, the number of possible

outcomes is 6.

More about probability