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Richard Ashby Wilson
moonless nights outdoors with his 10-inch Dobsonian reflector telescope
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Combinatorics: A Very Short Introduction Chuck Paprocki Richard Ashby WilsonHow many possible sudoku puzzles are there? In the lottery, what is the chance that two winning balls have consecutive numbers? Who invented Pascal's triangle? (it was not Pascal) Combinatorics, the branch of mathematics concerned with selecting, arranging, and listing or counting collections of objects, works to answer all these questions. Dating back some 3000 years, and initially consisting mainly of the study of permutations and combinations, its
