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