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O-LevelMathematicsProbability4024/22 · May/June 2025 · Q133 Marks

A bag contains 9 red counters and 3 green counters. Lee takes two counters from the bag at random without replacement. [Figure showing an incomplete tree diagram]

(a)Complete the tree diagram.[2]
(b)Work out the probability that both counters are red.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.

[2] B1 for 3/12 oe or 3/11 oe positioned correctly
[1] 6/11 oe

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About this question

Topic: Probability, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source: O-Level Mathematics, May/June 2025 Paper 2 Variant 2, question 13.

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