0580/21 May/Jun 2021, Question 17: Tree Diagrams for Dependent Events
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Calculator · 3 marks
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The question, in short
From a bag with 3 blue, 8 white and 5 red buttons, two are drawn without replacement. Find the probability both are red or both are white.
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Solution · 3 marks
- 116 buttons in total
- 2P(both red) = 5/16 × 4/15 = 20/240
- 3P(both white) = 8/16 × 7/15 = 56/240
- 4P = 20/240 + 56/240 = 76/240
- 5= 19/60
Answer19/60
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