MathDB
senators' committee in Flatland Congress 2020 MBMT p45

Source:

February 13, 2022
combinatoricsMBMT

Problem Statement

In the Flatland Congress there are senators who are on committees. Each senator is on at least one committee, and each committee has at least one senator. The rules for forming committees are as follows:
\bullet For any pair of senators, there is exactly one committee which contains both senators. \bullet For any two committees, there is exactly one senator who is on both committees. \bullet There exist a set of four senators, no three of whom are all on the same committee. \bullet There exists a committee with exactly 66 senators.
If there are at least 2525 senators in this Congress, compute the minimum possible number of senators ss and minimum number of committees cc in this Congress. Express your answer in the form (s,c)(s, c).