Mathematical and Physical Journal
for High Schools
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Problem C. 1245. (October 2014)

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 pont)

Deadline expired on November 10, 2014.


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