0580/33 Oct/Nov 2025, Question 5: Basic Probability

Cambridge IGCSE Mathematics 0580 · Paper 33 (Core) · Calculator · 3 marks

The question, in short

A fair spinner with 5 equal sections shows colours red, white, blue, red, white. For one spin, identify the least likely colour and give probabilities involving white and red.

Summarised in our own words. Use the official paper for the exact wording and the diagram.

Part (a) · 1 mark

State which colour has the smallest chance of being landed on.

1Red and white have 2 sections each, blue has 1
2Least likely: blue

AnswerBlue

Part (b) · 1 mark

Work out the chance of the spinner stopping on white.

1P(white) = 2/5

Answer2/5

Part (c) · 1 mark

Work out the chance that red is not the colour landed on.

1P(not red) = 1 − 2/5 = 3/5

Answer3/5

Stuck on a step? Read the free lesson: Basic Probability

Practise more basic probability questions

Real 0580 past-paper questions, marked on your working like the exam, with a worked solution for every part.

Practise free on Lemmara