Four people sit in a row: M is immediately left of N, and O is immediately right of N. Where can P sit?

  • A. only at the left end
  • B. only at the right end
  • C. at either end of the block M, N, O
  • D. between M and N

Explanation

The clues lock M, N and O into a fixed block in that order, so the only free positions for P are before M or after O. P cannot break into the block, since M, N and O are described as immediately adjacent. Identifying the fixed block first is the standard opening move.

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