Решение задачи N2809 теория вероятностей

2809. There are 16 students in the class: 6 boys and 10 girls. Before the lessons begin, the class teacher randomly selects two students of the class for duty in the office. What is the probability that there will be two girls on duty in the office?

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