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