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10. In a box, there are 9 blue, 6 white and some black stones. A stone is randomly selected and the probability that the stone

10. In a box, there are 9 blue, 6 white and some black stones. A stone is randomly selected and the probability that the stone is black is Find (a) the total number of stones in the box. (2 marks) (b) the probability of getting a blue stone.

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