Решение задачи N2905 теория вероятностей

2905. From 25 students of group 12 are engaged in scientific work at the department of boo. accounting, 7 - economic analysis, the rest - at the Department of Statistics. What is the probability that 2 randomly selected students are engaged in scientific work at the department of statistics?

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