How many persons live between E and F?
1. M live on 6th floor. 2. A lives immediately below M. 3. Only two persons live between M and B. 4. E live above B but not at the topmost floor. Note: E live on 7th floor not on 4th floor because no two persons according to alphabetical order live adjacent to each other. 5. Only one person sit between Z and B. 6. N live either 2nd or 7th floor. F cannot sit on topmost floor because no two persons according to alphabetical order live adjacent to each other
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