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?
Added by Tom F.
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This leaves us with 13 balls in the box: 7 green, 3 blue, and 3 white. Show more…
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