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​Q27: Answers – Paper 3 – June 2018

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Content:

• Combined Events – Probabilities: (example 2)​

Quizzes:​

• Combined Events – Probabilities

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Working
A bag contains 30 discs.
10 are red and 20 are blue.

• One disc is taken out at random and replaced by two of the other colour.
• Another disc is then taken out at random and replaced by two of the other colour.
• Another disc is then taken out at random.

Work out the probability that all three discs taken out are red.

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Question

27)
​A bag contains 30 discs.
10 are red and 20 are blue.

• One disc is taken out at random and replaced by two of the other colour.
• Another disc is then taken out at random and replaced by two of the other colour.
• Another disc is then taken out at random.

Work out the probability that all three discs taken out are red.

[3 marks]

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