Решение задачи N2756 теория вероятностей

2756. In the group of 12 students. 4 of them are excellent in math, 3 people are good, 5 people are satisfactory. 4 students are randomly selected. What is the probability that among them there are 2 excellent pupils and 2 are good enough

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