IGCSE Maths / Probability

Three stage tree diagrams revision notes

Edexcel International GCSE Maths (4MA1), chapter 20: Probability, specification point 6.3a. Part of the full course.

Watch the video lesson · IGCSE Maths past papers

A three-stage tree diagram shows the possible outcomes of three picks, with eight possible endings. Use the branches to track changing probabilities, then multiply along a path or use the opposite outcome to find the answer.

More lessons in Probability

• The language of probability and the probability scale
• Listing outcomes systematically
• Theoretical probability and sample space
• Relative frequency and mutually exclusive events
• Expected frequency and relative frequency
• Multiplying independent probabilities
• At least one, and the complement
• Tree diagrams with replacement
• Tree diagrams without replacement
• Probability problem solving
• Conditional probability from a two way table
• Conditional probability from a Venn diagram
• Conditional probability without replacement
• Forming an equation from a probability