Problem B. 4714. (May 2015)
B. 4714. Given 2015 points in the plane, show that if every four of them form a convex quadrilateral then the points are the vertices of a convex 2015sided polygon.
(4 pont)
Deadline expired on 10 June 2015.
Statistics:
80 students sent a solution.  
4 points:  55 students. 
3 points:  8 students. 
2 points:  6 students. 
1 point:  3 students. 
0 point:  8 students. 
