Problem B. 4669. (December 2014)

B. 4669. It is a known fact that 777-headed dragons have either 9 or 13 heads on their necks. Two dragons are considered identical if they have the same number of 9-headed necks. How many different 777-headed dragons are possible?

Suggested by Gy. Károlyi, Budajenő

(3 pont)

Deadline expired on January 12, 2015.

Statistics:

216 students sent a solution.
3 points:	117 students.
2 points:	51 students.
1 point:	46 students.
0 point:	2 students.

Problems in Mathematics of KöMaL, December 2014