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4.1.1 Probability (A-level only)

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Question 20

A drawer contains 8 white socks, 6 black socks, and 6 grey socks. Two socks are pulled from the drawer at random without replacement.

a.

Draw a tree diagram to represent this information.

[3]
b.

Find the probability that the two socks pulled are both grey.

[2]
c.

Given that at least one of the socks pulled is black, find the probability that both socks are black.

[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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