IGCSE Maths / Probability

Probability problem solving revision notes

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

Watch the video lesson · IGCSE Maths past papers

Probability problems often ask you to choose a diagram or method before you calculate. Use the wording to guide your choice, group outcomes where useful, and look for an earlier answer that can help with a later part.

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
• Three stage tree diagrams
• Conditional probability from a two way table
• Conditional probability from a Venn diagram
• Conditional probability without replacement
• Forming an equation from a probability