Q. What is the next number in the series: 4, 9, 19, 39, ___?
✅ Correct Answer: (B)
79
Explanation: Pattern: ×2 +1 → (4×2+1), (9×2+1), (19×2+1), (39×2+1) → next = 79.
Explanation by: Ankit Singh
Pattern: ×2 +1 → (4×2+1), (9×2+1), (19×2+1), (39×2+1) → next = 79.