Discussion
Four of the following are alike based upon their seating arrangement around the circle. Which is the one that does not belong to that group?
Answer: D
Correct answer: BG
Facing the centre, each person’s left is the next seat clockwise and their right the next seat anticlockwise. Fix D; F takes the seat on D’s right, and since F is three to A’s left, A is fixed too, as is G three to D’s left. B must sit beside G but not beside D; C may touch neither D nor A; and E may not touch D. Those three conditions leave only one filling. Clockwise the circle reads D → H → B → G → A → E → C → F.
In FH, GE, CD and EF the two people named have exactly one person sitting between them - D, A, F and C respectively. In BG the two sit side by side with nobody between, so that pair is the odd one out.
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