Problem K. 222. (October 2009)
K. 222. The diagram below shows the nets of four cubes unfolded in a plane. There are line segments painted on the surface of each cube, and these are also shown in the diagram. (No line is drawn along the edges of the cubes.) For which cube will the lines form a closed loop?
(6 pont)
Deadline expired on 10 November 2009.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. Az \(\displaystyle 1\), \(\displaystyle 2\), \(\displaystyle 4\) számú kockák mindegyikén kapunk zárt töröttvonalat.
Statistics:
297 students sent a solution.  
6 points:  124 students. 
5 points:  36 students. 
4 points:  12 students. 
3 points:  16 students. 
2 points:  57 students. 
1 point:  17 students. 
0 point:  15 students. 
Unfair, not evaluated:  20 solutions. 
