- AQ
- BL
- CN
- DO
Step-by-Step Solution
Original (floors 1-7): O, P, M, R, L, Q, N. Alphabetical (floors 1-7): L, M, N, O, P, Q, R. Only floor 6 is Q in both arrangements.
Answer: A) Q
Seven persons L, M, N, O, P, Q and R live on a seven-storey building. The ground floor is numbered 1, the floor above it 2, and so on up to the topmost floor numbered 7. Exactly two persons live on floors above L. Q lives on the floor immediately above L. N lives on the topmost floor. R lives on the floor immediately below L. O lives on the lowest floor. P lives on the floor immediately below M. If all seven persons are re-seated in alphabetical order from the lowest floor (1) to the top floor (7), exactly one person stays on the same floor as before. Who is that person?
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