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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 points)

This problem is for grade 9 students only.

Deadline expired on 11 January 2016.

Statistics on problem K. 483.
 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

•  Támogatóink: Morgan Stanley