Multiple choice general knowledge math & puzzles

Look at this series: 31, 29, 24, 22, 17, ... What number should come next?

  1. 15

  2. 14

  3. 13

  4. 12
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This series alternates between subtracting 2 and subtracting 5: 31-2=29, 29-5=24, 24-2=22, 22-5=17. Following this pattern, subtract 2 from 17 to get 15. The pattern is -2, -5, -2, -5.

AI explanation

The series alternates subtracting 2 and then 5: 31-2=29, 29-5=24, 24-2=22, 22-5=17, so the next step subtracts 2 to get 17-2=15.

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