CAIE IGCSE Mathematics extended complementary probability

Practise complement probabilities by changing a stated event into a not event and subtracting its probability from 1.

Syllabus
2028–2030
Objective
E8.1.4
Level
Extended

Exam points

  • use 1 - P(A) to find the probability that a stated event does not happen
  • convert a colour, weather or card event into its complement before calculating
  • write the complement answer as a fraction or decimal matching the question data

E8.1.4 Understand that the probability of an event not occurring = 1 – the question 1

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Figure for Question E8.1.4 Understand that the probability of an event not occurring = 1 – the question 1 — CAIE IGCSE Mathematics Extended

The diagram shows 11 cards.

One of these cards is chosen at random.
Write down the probability that the letter on the card is not A.

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