Multiple choice

Choose the correct alternatives from given ones that will complete the series. 5, 20, 80, 320, ?

  1. 1280

  2. 1380

  3. 1290

  4. 1480
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each number is multiplied by 4 to get the next number. 5 × 4 = 20, 20 × 4 = 80, 80 × 4 = 320. So the next number is 320 × 4 = 1280. This is a geometric progression with common ratio 4.

Keep practicing — related questions