Probability tree diagrams

What you'll learn

1. 1

   Imagine flipping a coin 🪙. It can land on Heads or Tails. A tree diagram shows all the possible outcomes, like branches on a tree!

2. 2

   How many branches does a tree diagram have for flipping one coin?

3. 3

   Build the tree diagram for flipping a coin twice. Drag the branches to show all possible outcomes.

4. 4

   Let's do a tree diagram for flipping a coin twice together.

5. 5

   How many total outcomes are there when you flip a coin twice?

6. 6

   Now try a bag with 2 red and 1 blue marble. Draw a tree diagram for picking one marble, then another without replacing.

7. 7

   If you pick a red marble first (2 red, 1 blue), how many marbles are left?