4024/12 May/Jun 2025, Question 2: Basic Probability
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
A bag holds 11 balls: 5 blue, 4 yellow, and the remainder green. One ball is drawn at random; find the probability it is yellow, and the probability it is not blue.
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Part (a) · 1 mark
Find the probability that the randomly taken ball is yellow.
- 1P(yellow) = 4/11
Answer4/11
Part (b) · 1 mark
Find the probability that the randomly taken ball is not blue.
- 1Not blue: 11 − 5 = 6 balls
- 2P = 6/11
Answer6/11
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