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2.3.10 Conditional probabilities (A-level only)

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Question 8

A bag contains 10 blue, 8 red and 6 green counters. Two counters are removed at random without replacement.

a.

Draw a tree diagram to represent the selections.

[3]
b.

Find the probability that both counters are green.

[2]
c.

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

[3]
Markscheme

2.3.10 Conditional probabilities (A-level only) Questions

  1. A Level
  2. /Maths
  3. /2.3.10 Conditional probabilities (A-level only)

164 exam-style questions on OCR (MEI) A Level Maths 2.3.10 Conditional probabilities (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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