Arrangements with restrictions — AMC & AIME Problems

Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses Arrangements with restrictions — a combinatorics concept — each with a professionally curated solution, many with a video solution too, from LIVE by Po-Shen Loh. Browse all concepts or the full past-contest archive.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

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AMC 8

1991 AMC 8 Problem 17 1994 AMC 8 Problem 24 2003 AMC 8 Problem 16 2004 AMC 8 Problem 2 2008 AMC 8 Problem 14 2011 AMC 8 Problem 23 2018 AMC 8 Problem 16 2020 AMC 8 Problem 10 2022 AMC 8 Problem 14 2026 AMC 8 Problem 17

More combinatorics concepts

basic countingbijectionBurnside’s LemmaCatalan Numbercircular arrangementscombinationscombinatorial gamecomplementary countingcounting integers in a rangecounting intersectionscounting pairscounting regionscounting shapes in figuresderangementsdouble countingfencepost countinggenerating functionsgraph theoryinclusion-exclusionlattice pathsmultiplication principlemultiset permutationspartitions and compositionsPascal’s Trianglepermutationspigeonhole principlerecursive countingstars and barssubsetstilingtree diagramVandermonde’s ConvolutionVenn Diagram