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Q 2535191062.     In five flats, one above the other, live five professionals. The professor has to go up to meet his lAS officer friend. The doctor is equally friendly to all, and has to go up as frequently as go down. The engineer has to go up to meet his MLA friend a'bove whose flat lives the professor's friend.
From the ground floor to the top floor, in what order do the five professionals live ?
IAS 2012 Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)