To determine the next number in the series, we first need to look at the pattern between the numbers.
The sequence begins with 7 and each subsequent number increases by 2:
- 7 + 2 = 9
- 9 + 2 = 11
- 11 + 2 = 13
- 13 + 2 = 15
Continuing this pattern, we add 2 to the last number:
- 15 + 2 = 17
Therefore, the next number in the series is 17.