From statement 1:
Three persons live between T and Q. Two persons live between S and V. More than two persons live between U and R.
| Case 1 | Case 2 | Case 3 |
| Floor | Person | Person | Person |
| 7 | T | S | |
| 6 | | Q | S |
| 5 | | | Q |
| 4 | S | V | |
| 3 | Q | | V |
| 2 | | T | |
| 1 | V | | T |
There were more possibilities
So, statement 1 alone is not sufficient to answer the question
From statement 3:
Four persons live between S and T. Three persons live between U and V. R lives immediately below V. Not more than two persons live between Q and V.
| Case 1 | Case 2 | Case 3 |
| Floor | Person | Person | Person |
| 7 | S | U | T |
| 6 | Q | S | |
| 5 | V | Q | |
| 4 | R | p | |
| 3 | P | V | |
| 2 | T | R | S |
| 1 | U | T | Q |
Case 3 is invalid.
From case 1, Q lives immediately above V
From case 2, P lives immediately above V
So, statement 3 alone is not sufficient to answer the question
From statement 1 and statement 2:
Three persons live between T and Q. Two persons live between S and V. More than two persons live between U and R. Two persons live between P and T. Q lives immediately above P. Two persons live between Q and R.
| Case 1 | Case 2 |
| Floor | Person | Person |
| 7 | S | U |
| 6 | Q | S |
| 5 | p | Q |
| 4 | V | p |
| 3 | R | V |
| 2 | T | R |
| 1 | U | T |
From the above cases, P lives immediately above V.
So, statement 1 and statement 2 together are sufficient to answer the question
From statement 2 and statement 3:
Two persons live between P and T. Q lives immediately above P. Two persons live between Q and R. Four persons live between S and T. Three persons live between U and V. R lives immediately below V. Not more than two persons live between Q and V.
| Floor | Person |
| 7 | U |
| 6 | S |
| 5 | Q |
| 4 | p |
| 3 | V |
| 2 | R |
| 1 | T |
P lives immediately above V
So, statement 2 and 3 together are sufficient to answer the question
From statement 1 and statement 3:
Using 'Two persons live between S and V' in statement 3, we get
| Case 1 | Case 2 |
| Floor | Person | Person |
| 7 | S | U |
| 6 | Q | S |
| 5 | V | Q |
| 4 | R | p |
| 3 | P | V |
| 2 | T | R |
| 1 | U | T |
Case 1 is invalid
From case 2, P lives immediately above V
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