Probability that the second is blue
You have a box with 3 red, 4 white, and 2 blue balls in it. Suppose you take two balls out of a box without replacement what is the probability that the second is blue?
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Colormetric method is used to test lake water for nitrates. If water specimens contain nitrates, a solution dropped into the water will cause the specimen to turn red 95% of the time.
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