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

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