Multiple choice general knowledge math & puzzles

Look at this series: 70, 71, 76, __, 81, 86, 70, 91, . . . What number should fill the blank?

  1. 70

  2. 71

  3. 80

  4. 96

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

This series follows an alternating pattern: +1, +5, with 70 as a reset anchor. The pattern is: 70, 71 (+1), 76 (+5), 70 (reset), 81 (+11 from previous reset), 86 (+5), 70 (reset), 91 (+21 from previous reset). The blank must be 70 to maintain this reset pattern every 4th position.