The missing number in the series 9, 25, 49, ___, 169 is 121.
Series Explanation
According to the reference, the series is composed of perfect squares. Specifically:
- 9 = 32
- 25 = 52
- 49 = 72
- The missing number is presumed to be 112 = 121
- 169 = 132
Therefore, the complete series is 9, 25, 49, 121, 169, which represents the squares of consecutive odd prime numbers.
| Number | Square Root |
|---|---|
| 9 | 3 |
| 25 | 5 |
| 49 | 7 |
| 121 | 11 |
| 169 | 13 |
