Problem C. 1318. (November 2015)
C. 1318. The number 518 has an interesting property. Consider the six threedigit numbers obtained with the different permutations of the digits of 518. The mean of these numbers is equal to 518. Find all threedigit numbers of different digits with this property.
(5 pont)
Deadline expired on 10 December 2015.
Statistics:
211 students sent a solution.  
5 points:  81 students. 
4 points:  47 students. 
3 points:  16 students. 
2 points:  26 students. 
1 point:  25 students. 
0 point:  13 students. 
Unfair, not evaluated:  1 solution. 
Unfair, not evaluated:  2 solutions. 
