This website contains problems from math contests. Problems and corresponding tags were obtained from the Art of Problem Solving website.

Tags were heavily modified to better represent problems.

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Found problems: 2

2010 Contests, 1

Prove that in each year , the $13^{th}$ day of some month occurs on a Friday .

2010 ISI B.Math Entrance Exam, 1

Prove that in each year , the $13^{th}$ day of some month occurs on a Friday .