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?

1. IAS officer, Engineer, Doctor, Professor, MLA
2. Engineer, Professor, Doctor, IAS officer, MLA
3. Professor, Engineer, Doctor, MLA, IAS officer
4. Professor, Engineer, Doctor, IAS officer, MLA

Answer

Let flats be on floors be 1, 2, 3, 4, and 5.

The professor has to go up to meet his IAS officer friend. So, Professor lives on lower floor than IAS officer.

Conclusion: P < I

The doctor is equally friendly to all, and has to go up as frequently as go down.

Conclusion: D = 3 (- - D - -)

The engineer has to go up to meet his MLA friend.

Conclusion: E < M

Above MLA friend, lives the professor's friend.

Conclusion: M < I (Professor's friend is IAS)

Combine all the conclusions: - - D M I

The correct option is C.