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Combinatorics
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Demonstrations 1  20 of 280
Polygons within Polygons
New this month
Substitution Tilings
Pascallike Triangle Made from a Card Game
Path Nets for Dodecahedron and Icosahedron
Pisot, Salem and Cyclotomic Polynomials
Arranging Balls into Boxes
Counting Necklaces
The Birthday Problem and Some Generalizations
Tournaments
Permutations, Derangements, and Other Forbidden Position Problems Using NonAttacking Rooks
Proving Euler's Polyhedral Formula by Deleting Edges
Rule of Sum and the InclusionExclusion Principle
Polygons on n Vertices
Constrained Optimal Routes in 3D Space
Inscribed Triangles in Polygons
The Nine 10_3 Configurations
Mazes on Polyhedra Maps
Spanning Tree of Points on Sphere
Graphs of Random Permutations
Permutations, kPermutations and Combinations
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