Multiple choice

Find the missing term in the following number series: 8, 15, 28, 49, 80, ?

  1. 123

  2. 132

  3. 108

  4. 232
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The series is 8, 15, 28, 49, 80, ?. Analyzing the differences: 15-8=7, 28-15=13, 49-28=21, 80-49=31. These differences themselves have a pattern: 13-7=6, 21-13=8, 31-21=10. The second differences increase by 2. Following this pattern, the next second difference is 12, so the next first difference is 31+12=43. Therefore, the next term is 80+43=123.

Keep practicing — related questions