Combinatorics problems by Tom Davis

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Grade Vs Difficulty:
  EasyModerateChallengingPerplexing
1-2
3-4
5-6
7-8
9-10
11-12
13-14

This is a collection of combinatorics problems submitted by Tom Davis.

http://www.geometer.org/mathcircles/

General discussion may be found at Combinations and Permutations and Counting.