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combinatorics

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The Nine Schoolgirls Challenge

By Thomas Lin
June 9, 2015
Read Later

Solve this variation of Thomas Kirkman’s famous 1850 puzzle by arranging girls in walking groups. And think fast — the clock is ticking.

Mathematics

A Design Dilemma Solved, Minus Designs

By Erica Klarreich
June 9, 2015
Read Later

A 150-year-old conundrum about how to group people has been solved, but many puzzles remain.

Mathematics

For Persi Diaconis’ Next Magic Trick …

By Erica Klarreich
April 14, 2015
Read Later

A mathematician who has analyzed card shuffling for decades is tackling one final nemesis: “smooshing.”


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