Question
How many persons are there between A and
F? Study the following information carefully and answer the question given below: There are eight people A, B, Y, Z, M, N, E and F are living in a 8 floor Building on different floors from top to bottom (such as ground floor is numbered as 1 and top floor is numbered as 8) but not necessarily in the same order. M lives immediately above the floor on which Y lives but not on an even numbered floor. Z lives on the floor which is a prime number but not on the 3rd floor. N lives immediately below the floor on which B lives. The person lives between A and Y is not more than three and not less than two. A live on the topmost floor. There is one person living between the floors on which F and Z lives. F lives immediately above the floor on which B lives.Solution
1. Z lives on the floor which is a prime number but not on the 3rd floor. 2. A lives on the topmost floor. 
3. M lives immediately above the floor on which Y lives but not on an even numbered floor. 4. There is one person living between the floors on which M and Z lives 
In CASE1 M live in even floor so CASE1 is cancelled out. 5. The person lives between A and Y is not more than three and not less than two. 
In CASE2A and CASE2B the person lives between A and Y is more than three and less than two. So, CASE2A and CASE2B is cancelled out. 6. F lives immediately above the floor on which B lives. 7. N lives immediately below the floor on which B lives 
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