In five flats, one above the other, live five professionals. The professor has to go up to meet his IAS 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 above whose flat lives the professor’s friend. From the ground floor to the top floor, in what order do the five professionals live?
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The constraints force the symmetric doctor to the middle, with the professor below his IAS friend and the engineer below his MLA friend; the consistent order from ground to top is Professor, Engineer, Doctor, MLA, IAS officer.