Problem A. 645. (May 2015)
A. 645. Do there exist infinitely many (not necessarily convex) 2015-gons in the plane such that every three of them have a common interior point, but no four have a common point?
Deadline expired on June 10, 2015.
|2 students sent a solution.|
|1 point:||1 student.|
|0 point:||1 student.|