Mathematical and Physical Journal
for High Schools
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Problem A. 518. (November 2010)

A. 518. How many distinct subsets A1,...,At of an n-element set can be chosen such that (A_i\cap A_k)\subseteq A_j for all 1\lei<j<k\let?

(Miklós Schweitzer Competition, 2010)

(5 pont)

Deadline expired on December 10, 2010.


Statistics:

14 students sent a solution.
5 points:Ágoston Péter, Ágoston Tamás, Bágyoni-Szabó Attila, Frankl Nóra, Mester Márton, Nagy 235 János, Nagy 648 Donát, Strenner Péter, Viharos Andor, Weisz Ágoston, Zsakó András.
4 points:Backhausz Tibor, Damásdi Gábor, Lenger Dániel.

Problems in Mathematics of KöMaL, November 2010