Abstract
Each summand k corresponds to adjacent numbers of the collection which differ by k. Fix the numbers c and \(c+k,\) and find the number of collections in which the numbers c and \(c+k\) are adjacent.
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Brayman, V., Kukush, A. (2017). 1997. In: Undergraduate Mathematics Competitions (1995–2016). Problem Books in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-319-58673-1_25
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DOI: https://doi.org/10.1007/978-3-319-58673-1_25
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