A bag contains 4 white, 5 red and 6 blue balls. Three balls drawing at random from the t them are red is _____?
- 2/91
- 2/77
- 1/22
- None of these
Explanation
Total ways to draw 3 balls = C(15, 3) = 455
Ways to draw 3 red balls = C(5, 3) = 10
Probability = 10/455 = 2/91
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