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Conditional Probability
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Event notation and overlap

Event notation and overlap

Probability questions use events such as AAA and BBB. The complement A′A'A′ means AAA does not happen, the intersection A∩BA \cap BA∩B means both happen, and the union A∪BA \cup BA∪B means at least one happens. For two events, the "or" formula is:

Conditional Probability Lesson

  1. A Level
  2. /Maths
  3. /Conditional Probability

Step-by-step lessons covering Edexcel A Level Maths Conditional Probability for A Level Maths. Each lesson breaks down 2.1 Set Notation, 2.2 Conditional Probability, 2.3 Conditional Probabilities in Venn Diagrams, 2.4 Probability Formulae, and 2.5 Tree Diagrams, then works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build fluency with the core pure algebra and calculus toolkit early, since almost every mechanics and statistics topic on the course depends on it.