2547. In an urn there are 20 white and 6 black balls. T

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2547. In an urn there are 20 white and 6 black balls. Two balls in a row are taken out at random from it. Find the probability that both balls are black. Find the probability of the same event, provided that the first ball drawn is returned to the urn and all the balls are stirred.

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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