40 objects are placed along a circle at equal distances, choose 3
Source: CRMO 2015 region 4 (Karnataka) p4
September 30, 2018
combinatoricscombinatorial geometrycircle
Problem Statement
Suppose objects are placed along a circle at equal distances. In how many ways can objects be chosen from among them so that no two of the three chosen objects are adjacent nor diametrically opposite?