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4.1.1 Probability (A-level only)

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Question 23

A bag contains 10 blue counters, 8 red counters and 6 green counters. Two counters are removed from the bag at random.

a.

Draw a tree diagram to represent this information

[3]
b.

Find the probability that the two counters removed are both green

[2]
c.

Given that at least one of the counters removed is red, find the probability that both counters are red.

[3]
Markscheme

4.1.1 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.1.1 Probability (A-level only)

111 exam-style questions on WJEC A Level Maths 4.1.1 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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