Multiple choice general knowledge math & puzzles

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

  1. 12

  2. 15

  3. 14

  4. 13
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern alternates between subtracting 2 and subtracting 5: 31-2=29, 29-5=24, 24-2=22, 22-5=17. The next operation should be -2, giving 17-2=15. Option A (12) would require subtracting 5, which is the wrong alternating step.

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