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Learning objective

Determine conditional probability using Venn diagrams, tree diagrams, and tables, while understanding the notation P(A|B). Knowledge of the formulas related to conditional probability is not necessary.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE MathematicsExtended ProbabilitySupplement content

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Quick explanation

Determine conditional probability using Venn diagrams, tree diagrams, and tables, while understanding the notation P(A|B). Knowledge of the formulas related to conditional probability is not necessary

  • This point belongs to Conditional probability, especially Conditional probability outcomes.
  • You need to be able to determine conditional probability using Venn diagrams, tree diagrams, and tables, while understanding the notation P(A|B). Knowledge of the formulas related to conditional probability is not necessary.
  • The key ideas to know are Calculate, Determine, and Show.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

CalculateDetermineShowWork out

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Paper 2 structured question: Conditional probability

Paper 2Core or Extended Mathematics3 marks

Description

Conditional Probability with Balls

A bag contains 5 red balls and 3 blue balls. A ball is drawn at random, not replaced, and then another ball is drawn.

  1. a

    Calculate the probability that the second ball drawn is red, given that the first ball drawn was blue.

    Aim for approximately 3 distinct marking points.

    [3]
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