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28 objects are placed along a circle at equal distances, choose 3

Source: CRMO 2015 region 1 p4

September 30, 2018
combinatoricscombinatorial geometrycircle

Problem Statement

Suppose 2828 objects are placed along a circle at equal distances. In how many ways can 33 objects be chosen from among them so that no two of the three chosen objects are adjacent nor diametrically opposite?