Multiple choice general knowledge math & puzzles

Which is the number that comes next in the sequence? 3 1 7 2 13 3 21 4 31 5....

  1. 43

  2. 6

  3. 52

  4. 13

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

The sequence alternates: (3, 7, 13, 21, 31) and (1, 2, 3, 4, 5). In the first set, the differences are +4, +6, +8, +10. The next difference is +12, so 31 + 12 = 43.