Question
Seven persons A, B, C, D, M, N and O live on different
floors of a seven storey building. The bottommost floor is numbered 1 and the topmost floor is numbered 7. Who lives on floor 5? Statement I: A lives two floors above B. Two persons live between B and O, who lives on floor 1. M lives immediately above N. Statement II: A lives above C. One person lives between C and M. O lives below M. B lives above O but not immediately above O. Statement III: M lives two floors above O. At least three persons live above M. Two persons live between M and A. C lives immediately above B. D lives above C. The question given below consists of three statements numbered I, II and III below them. You have to decide whether the data provided in the statements are sufficient to answer the question. Read all the statements and give answer:Solution
From statement I, as A lives two floors above B. Two persons lives between B and O, who lives on floor 1. M lives immediately above N, so 
From statement II alone, as A lives above C. One person lives between C and M. O lives below M. B lives above O but not immediately above, so no proper arrangement is possible. From statement III alone, as M lives two floors above O. At least three persons lives above M. Two persons lives between M and A. C lives immediately above B. D lives above C, so 
Data given in both statements I and III together or both statements I and II together or both II and III is sufficient.
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