Problem K. 483. (December 2015)
K. 483. In how many different ways is it possible to write the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 on the circumference of a circle so that no sum of adjacent numbers is a multiple of 3, 5 or 7?
(6 pont)
Deadline expired on 11 January 2016.
Statistics:
105 students sent a solution.  
6 points:  75 students. 
5 points:  7 students. 
4 points:  7 students. 
3 points:  2 students. 
2 points:  4 students. 
1 point:  2 students. 
0 point:  8 students. 
