Seven persons, Arjun, Charu, Ehsan, Nusrat, Ritu, Yasmin and Zara, live on the seven floors of a building, one person per floor. The lowest floor is numbered 1 and the top floor is numbered 7. Charu lives on some floor above Ritu, but not immediately above. Arjun lives on a floor below Zara. Charu lives on some floor above Nusrat, but not immediately above. Only one person lives between Ritu and Ehsan. Charu lives neither on the top floor nor on the lowest floor. Exactly two persons live between Ehsan and Zara. Exactly three persons live between Nusrat and Arjun. Who lives on the floor immediately above Nusrat?
Correct answer D. Ritu
Explanation
From floor 1 upwards the only valid order is Nusrat, Ritu, Yasmin, Ehsan, Arjun, Charu, Zara. Hence Ritu lives immediately above Nusrat.
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