Решение задачи N2758 теория вероятностей

2758. There are 15 students in the group. 4 of them are excellent in math, 3 people are good, 8 people are satisfactory. 4 students are randomly selected. Find the probability that among them there are 2 “honors pupils" and 2 "horoshistas".

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