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12 students, n perfomances, 6 in each , largest n

Source: 21st Philippine Mathematical Olympiad 2019 p2 PMO

January 7, 2020
combinatoricsdouble counting

Problem Statement

Twelve students participated in a theater festival consisting of nn different performances. Suppose there were six students in each performance, and each pair of performances had at most two students in common. Determine the largest possible value of nn.