There are 15 balls in a box: 8 balls are green, 4 are blue and 3 are white. Then 1 green and 1 blue balls are taken from the box and put away. What is the probability that a blue ball is selected at random from the box?

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There are 15 balls in a box: 8 balls are green, 4 are blue and 3 are white. Then 1 ...

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