Discussion
Which of the following information is not necessary to determine the position of A?
Answer: D
Correct answer: All informations are necessary
They face east, so right means south and left means north. D is third from the south end and C just to his right, that is just south of him. B is at an end with E beside him, which can only be the north end, and G sits between E and F. Reading from north to south the wall holds B, E, G, F, D, C, A.
Every clue does work: without any one of them the places of the others could not all be fixed, and A’s seat is only settled once the rest are. So all the information is necessary.
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