Solution of problem N3045 probability theory

Solution of problem N3045 probability theory

3045. In the box are 15 balls, of which 5 are blue and 10 are red. 2 balls are successively taken out of the box; The first ball in the box does not return. Find the probability that the first ball drawn will be blue, and the second - red.

Additional information:

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