Solution of problem N2802 probability theory

Solution of problem N2802 probability theory

2802. In the student group there are 12 boys and 8 girls. Randomly chose 2 students (by numbers in lists) for duty. Find the probability that:
1) both students are girls
2) the young man and the girl will be on duty.

Additional information:

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

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