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2.3 Probability

2.3 Probability

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Question 143

A bag contains 15 red counters and 9 blue counters. Two counters are selected at random, without replacement.

a.

Find the probability that both counters selected are blue.

[2]
b.

Find the probability that one counter of each colour is selected.

[3]
Markscheme

2.3 Probability Questions

  1. A Level
  2. /Maths
  3. /2.3 Probability

200 exam-style questions on OCR A Level Maths 2.3 Probability, covering 2.3.1 Mutually exclusive and independent events, 2.3.2 Diagrams to assist probability calculations, 2.3.3 Conditional probability (A-level only), 2.3.4 Conditional probability from first principles (A-level only), and 2.3.5 Modelling with probability. Each one has a worked solution and a mark scheme showing where the marks go.

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