4307. In the box are 3 white and 4 black ball identical

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Description 4307. In the box are 3 white and 4 black ball identical

4307. In the box are 3 white and 4 black ball identical to the touch. 2 balls are taken out at random. Find the probability of an event: 1) both elongated balls of white, 2) elongated balls of different colors.

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

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