Guichard-Combinatorics-Graph-Theory · Problem 4.1.2

Systems of Distinct Representatives

Mathematics — Probability · systems-of-distinct-representatives

Problem

How many different systems of distinct representatives are there for the sets Ai=[n]∖iA_i = [n]\setminus i, i=1,2,…,ni = 1, 2, \ldots, n, n≥2n \geq 2?

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