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 January 11, 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.

Problems in Mathematics of KöMaL, December 2015