A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
12, 60, 240, 720, ?
- A1440
- B1420
- C1400
- D1480
Solution & Step-by-step Explanation
Let's determine the multiplication factor between consecutive terms:
12×5=60
60×4=240
240×3=720
The multiplier decreases by 1 at each step (×5,×4,×3). Therefore, the next multiplier must be ×2:
720×2=1440
12×5=60
60×4=240
240×3=720
The multiplier decreases by 1 at each step (×5,×4,×3). Therefore, the next multiplier must be ×2:
720×2=1440