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GCSE Maths

Probability

Tree Diagrams

Tree Diagrams

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Level 5–7
Foundation & Higher
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Key Points 

  • Tree diagrams show all possible outcomes of successive events.

  • Multiply probabilities along each branch.

  • Add probabilities across branches when finding the probability of multiple outcomes.

  • Check that probabilities from each split add to 1.

  • Be careful whether events are with replacement or without replacement.


Keywords: tree diagrams, probability, independent events, dependent events, replacement, GCSE probability.

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