Probability Tree Worksheet Page 4
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3. Matthew puts 3 red counters and 5 blue counters in a bag.
He takes at random a counter from the bag.
He writes down the colour of the counter.
He puts the counter in the bag again.
He then takes at random a second counter from the bag.
(a) Complete the probability tree diagram.
1st counter
2nd counter
3
Red
8
3
Red
8
........
Blue
Red
........
........
Blue
........
Blue
(2)
(b) Work out the probability that Matthew takes two red counters.
...........................
Q3
(2)
(Total 4 marks)
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