Learn how to use probability tree diagrams to calculate the probability of an event happening. Bobby introduces the topic, Susan uses an interactive tool on GeoGebra – click here to join in at home – and Tom applies what we’ve learned to a fictional FA Cup quarter final draw.

This is the sixth lesson in a new series with the Maths Appeal duo – Bobby Seagull and Susan Okereke – and Tom Rocks Maths where we’ll be exploring the GCSE Maths syllabus to show the world that maths is accessible to everyone!