Multiple choice

Find the missing term in the following series: 20, 5, 7, 20, 9, 11, ?

  1. 20

  2. 13

  3. 12

  4. 7

  5. 15
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The series follows an alternating pattern or two interleaved series. One series is 20, 7, 9 (not clear) or simply a repeating sequence 20, 5, 7, 20, 9, 11, 20. The pattern is (20, 5, 7), (20, 9, 11), (20, ...).

AI explanation

This series follows a mixed pattern where every third term is a constant 20, while the remaining terms form two separate alternating sequences increasing by 2. The sequence of constants appears at the first, fourth, and seventh positions. Therefore, the missing term at the seventh position is 20.

Keep practicing — related questions