Starting a tree diagram The chance that the alarm is triggered depends on whether or not the bag contains a forbidden item, so we should first distinguish between bags that contain a forbidden …

Tree diagrams display all the possible outcomes of an event. Each branch in a tree diagram represents a possible outcome. Tree diagrams can be used to find the number of possible …

Using a tree diagram to work out a conditional probability question. If someone fails a drug test, what is the probability that they actually are taking drugs?

This is part of the tree method: rather than assigning specific probabilities to each leaf (or branch), we construct the tree so that all leaves under the same node all have the same probability.

Counting principle and factorial Learn Count outcomes using tree diagram Counting outcomes: flower pots

The tree diagram below shows all the possible outcomes of flipping three coins. At the top of the tree, this shows us the two outcomes for the first coin, and then given each of those outcomes, …

Two-way tables, Venn diagrams, and probability Get 3 of 4 questions to level up!

Explore the notion of a "sample space". See a sample space represented as a tree diagram, table, and list.

Practice counting possible outcomes in a variety of situations. These problems cover everything from counting the number of ways to get dressed in the morning to counting the number of …

Practice Two-way tables, Venn diagrams, and probability Get 3 of 4 questions to level up!