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4.1.1 Probability (A-level only)

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Question 29

A bag contains 10 blue counters, 8 red counters and 6 green counters. Two counters are removed from the bag at random.

a.

Draw a tree diagram to represent this information.

[3]
b.

Find the probability that the two counters removed are both green.

[2]
c.

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

[3]

4.1.1 Probability (A-level only) Questions

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