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C. 1245. Consider two consecutive triangular numbers and add one of them to the triple of the other. Prove that the result is also a triangular number.

(5 points)

This problem is for grade 1 - 10 students only.

Deadline expired on 10 November 2014.

Statistics on problem C. 1245.
 198 students sent a solution. 5 points: 145 students. 4 points: 30 students. 3 points: 7 students. 2 points: 5 students. 1 point: 6 students. 0 point: 5 students.

• Problems in Mathematics of KöMaL, October 2014

•  Támogatóink: Morgan Stanley