Решение задачи N2759 теория вероятностей

2759. There are 25 students in the group. 5 of them are excellent in math, 12 are good, 6 are satisfactory and 2 are poor. 6 students are chosen for good luck. What is the probability that 4 of them are excellent students and 2 are good?

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