Multiple choice

Look at this series. 7, 18, 11, 15, 15, 12, 19, ...

What numbers should come at 9th and 10th place, respectively?

  1. 6 and 23

  2. 23 and 6

  3. 23 and 4

  4. 22 and 6

  5. 9 and 23

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It consists of two series : First series : 7, 11, 15, 19 (4 is added) Second series : 18,15, 12 (3 is subtracted) The series continues as: 7, 18, 11, 15, 15, 12, 19, 9, 23, 6, 27 and so on. Hence, the 9th and 10th numbers are 23 and 6, respectively.