1. C lives on the third numbered floor. 2. Only two persons live between the floors of C and O. 
3. Only one person lives between the floors of M and N. 4. M lives above N. 
5. Only one person lives between the floors of C and D. 6. C lives on one of the floor below the floor of M. 7. P lives on the floor immediately above the floor on which B lives. 
There is no space for P and B in CASE1A so CASE1A is cancelled out. Final arrangement: 
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