Multiple choice general knowledge science & technology

complete the series: 3 , 7 , 13 , 21 , _.

  1. 33

  2. 29

  3. 31

  4. 41
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern adds consecutive odd numbers starting from +4: 3 (+4=7), 7 (+6=13), 13 (+8=21), 21 (+10=31). Each increment increases by 2.

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