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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 points)

Deadline expired on 12 January 2015.

Statistics on problem B. 4669.
 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

•  Támogatóink: Morgan Stanley