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Description
Here is a puzzle based on an array of ten hexagons whose vertices are numbered. It is a modified version of an array used as an illustration in an article by Choe, Choi, and Moon. See the reference in the wikipedia article: https://en.wikipedia.org/wiki/Hexagonal_tortoise_problem and also thing:2586578 and thing:2591827
The sums of the numbers at the vertices of 9 of the hexagons are 99; an error has been introduced and the sum of the vertices at the 10th hexagon is 98.
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Find the hexagon with the incorrect sum.
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Switch numbers at the vertices of the hexagons so as to fix the incorrect sum without changing the sums at the other 9 hexagons.
The answer, (the original illustration), is given. Paper versions as pdf files are also given.
The openSCAD code generates other arrays which might be useful for study or decoration.
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