3260. There are 21 balls in the basket, among which 6 a

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3260. There are 21 balls in the basket, among which 6 are white, 7 are black and 8 are red. Randomly extracted 7 balls. Find the probability that 5 is white, 1 is black and 1 is red.

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

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