Probability · Question 13 · Hard
Probability question 13
A bag contains 4 red, 3 green and 2 blue balls. Three balls are drawn at random. What is the probability that they are all of different colours?
- 3/14
- 2/7
- 8/21
- 1/3
Answer and explanation
Answer: B. 2/7
Explanation: Favourable = 4 × 3 × 2 = 24. Total = 9C3 = 84. Probability = 24/84 = 2/7.
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