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Option 3 : R

According to the given information-

1) X lives on the lowest floor.

2) Three persons live between X and A.

Floors

Persons

5

A

4

 

3

 

2

 

1

X

3) R lives just above D. D is not an immediate neighbour of X.

The final arrangement is given below

Floors

Persons

5

A

4

R

3

D

2

Q

1

X

Hence, R lives on the 4th floor.
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