Six people sit around a circular table facing the centre. P sits opposite S. Q sits immediately to the right of P. Who sits immediately to the left of S?

  • A. P
  • B. Q
  • C. R
  • D. cannot be determined without more information

Explanation

Only three of the six positions are fixed by the clues, so the seats around S could be filled by any of the remaining people. A well posed question must pin down enough places, and recognising when it has not is part of the skill. Adding one more clue about R or T would usually settle it.

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