Probability: Tree Diagrams


The results of a coin toss.
There are 2 possible outcomes (2).


The results of 2 coin tosses.
There are 4 possible outcomes (2 x 2).


The results of 3 coins tosses.
There are 8 possible outcomes (2 x 2 x 2).


The results of 4 coin tosses, there are 16 possible outcomes (2 x 2 x 2 x 2),
and each is equally likely. Here is the tree diagram for four tosses: