- Let's examine the series: **7, 9, 13, 15, ?, 21, 25**.
- Notice the pattern by looking at the gap between each number:
- 9 - 7 = 2
- 13 - 9 = 4
- 15 - 13 = 2
- The pattern alternates with differences of 2 and 4.
- Continuing this pattern:
- After 15, the next number should have a difference of 4.
- 15 + 4 = **19** (This fits the pattern).
- Following this, 21 - 19 = 2, confirming the ongoing pattern.
- **Option 1: 19** is the correct answer. ✅

YOUR ANSWER IS RIGHT