MathDB

7

Part of 2023 Moldova Team Selection Test

Problems(1)

one of the disks contains the center of another disk

Source: Moldova TST 2023

4/8/2023
Find all integers n n (n≥2)(n\geq2) with the property: for every n n distinct disks in a plane with at least a common point one of the disks contains the center of another disk.
combinatorics