Multiple choice general knowledge math & puzzles

Fill in the missing number in the series: 3,10,7,8,?,12,9,16

  1. 11

  2. 10

  3. 9

  4. 8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sequence consists of two interleaved series. Series 1 (odd positions): 3, 7, ?, 9. Series 2 (even positions): 10, 8, 12, 16. Series 1 logic: +4, then -2? No. Series 2 logic: -2, +4, +4. Actually, Series 1 is 3, 7, 11, 15 (adding 4). 11 fits perfectly.

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