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AMC combinatorics problems

Counting techniques, permutations and combinations, recursion, bijections and graph theory. 340 problems across 27 concepts. 188 come from the AMC 10 and 152 from the AMC 12.

Picks a problem you have not seen, at about the difficulty you are handling.

Concepts in combinatorics

60 most recent problems

Newest contests first. Every problem opens with its answer choices, hints and a worked solution.

Use Start combinatorics practice above to work through the remaining 280.