Решение задачи N3050 теория вероятностей

3050. In the urn 6 blue, 5 red and 4 white balls. Allow the ball to be removed from the urn without returning it. Find the probability that a blue ball appears at the first extraction (event A), at the second - a red ball (event B), at the third - a white ball (event C).

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