Question
A bag contains 9 blue, 12 yellow and 15 black balls. Two balls are randomly drawn from the bag, what is the probability that a blue and a yellow ball are drawn?
Solution
The probability that a blue and a yellow ball are drawn = (9C1 × 12C1) / 36C2
= (9 × 12) / 630 = 108 / 630 = 6/35
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