probability
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I have two boxes with balls; box #1 and box #2. Box #1 has 3 red balls and 2 blue balls.Box #2 has 7 red balls and 3 blue balls. what is the probability that if a red ball is picked, it is from box #1
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Three boxes contain 26, 28 and 30 balls. The ratios of red balls to all balls in each of these three boxes are 50%, 25%, and 20%. All the balls are placed in a large box. What is the ratio of red balls to all balls in the box?
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A box contains 8 blue balls and 2 red balls. Three balls are selected from the box at random without replacement. Find the probability that two balls are blue and one ball is red.
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A box contains some red balls and some blue balls. There are four more blue balls than red balls. A ball is removed at random, replaced and a second ball randomly removed. The probability that the two balls are different colours
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