Draw a dot on your paper to represent the first instance of your event occurring. For our example, we are going to make a tree diagram for flipping a coin five times.
Figure out how many different outcomes your first event will have. For example, flipping a coin can result in two possible outcomes: heads or tails. Draw a line for each outcome. Each line should branch out away from the other.
Write a letter at the end of each line that identifies the outcome. For example, you could write "H" for heads and "T" for tails.
Draw lines from your first outcome to represent the second possible outcome. For example, each original outcome of a coin flip can have two more outcomes: heads or tails. You have to draw four lines, two from each outcome. Write the corresponding letter for each new outcome.
Repeat the process until you have gone through all the events. Count all of the outcomes at the end of your tree to find the possible outcomes. For example, after you have branched out your five coin flip tree diagram, you will have 32 possible outcomes.