Problem B. 4669. (December 2014)
B. 4669. It is a known fact that 777headed dragons have either 9 or 13 heads on their necks. Two dragons are considered identical if they have the same number of 9headed necks. How many different 777headed dragons are possible?
Suggested by Gy. Károlyi, Budajenő
(3 pont)
Deadline expired on 12 January 2015.
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