There are n triangles inscribed in a circle and all 3n of their vertices are dif
Source: 2016 239 J8
October 11, 2020
combinatoricscombinatorics unsolvedcombinatorial geometry
Problem Statement
There are triangles inscribed in a circle and all of their vertices are different. Prove that it is possible to put a boy in one of the vertices in each triangle, and a girl in the other, so that boys and girls alternate on a circle.