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2.3 Probability

2.3 Probability

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Question 119

Two bags, A A\,A and BBB, contain red, green and yellow counters.

Bag A A\,A contains 3 red, 2 green and 4 yellow counters. Bag B B\,B contains 5 red, 4 green and 1 yellow counter.

Taylor takes one counter at random from bag A A\,A and places it into bag BBB. She then takes one counter at random from bag BBB.

a.

Find the probability that Taylor's two counters are the same colour.

[3]
b.

Given that the two counters are the same colour, find the probability that they are both yellow.

[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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