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Combinatorics
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Demonstrations 21  40 of 291
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
Labeled FussCatalan Polygon Divisions
Acute Sets in Euclidean Spaces
Moser Spindles, Golomb Graphs and Root 33
Diagonals of Polyhedra
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