Multiple choice general knowledge math & puzzles

Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?

  1. 7

  2. 10

  3. 14

  4. 15

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

This series alternates between two patterns: add 1, then add 3. Starting from 3: 3+1=4, 4+3=7, 7+1=8, 8+3=11, 11+1=12. Following this pattern, add 3 to 12 to get 15.

AI explanation

The series alternates adding 1 and then 3: 3+1=4, 4+3=7, 7+1=8, 8+3=11, 11+1=12, so the next step adds 3 to get 12+3=15.