BALKAN-SL 2014 C2
Let and let be a circle. For every nonempty subset of the set , denote by sum of elements of the set , and define ( is the empty set ). Is it possible to join every subset of with some point on the circle so that following conditions are fulfilled: . Different subsets are joined with different points; . All joined points are vertices of a regular polygon; . If are some of the joined points, , such that is a regular , then divides ?
Dataset text AI-MO AoPS. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
Similar problems
These problems have the most words in common with this statement.