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The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It was first published in 1969 by Hans Freudenthal,[1][2] and the name Impossible Puzzle was coined by Martin Gardner.[3] The puzzle is solvable, though not easily. There exist many similar puzzles.
- ^ Hans Freudenthal, Nieuw Archief Voor Wiskunde, Series 3, Volume 17, 1969, page 152
- ^ Born, A.; Hurkens, C. A. J.; Woeginger, G. J. (2006). "The Freudenthal problem and its ramifications (Part I)" (PDF). Bulletin of the European Association for Theoretical Computer Science, EATCS. 90: 175–191.
- ^ Gardner, Martin (December 1979), "Mathematical Games: A Pride of Problems, Including One That Is Virtually Impossible", Scientific American, 241: 22–30, doi:10.1038/scientificamerican0979-22.