Question
A bag contains 6 purple, 15 green and 9 red balls. Two
balls are randomly drawn from the bag, what is the probability that a green and a red ball are drawn?Solution
The probability that a green and a red ball are drawn = (15C1 × 9C1) / 30C2 = (15 × 9) / 435 = 135/435 = 9/29
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