Multiple choice

A number series is given with one term missing. Choose that correct alternative which will complete the series. 109, 74, 46, 25, 11, ?

  1. 36

  2. 0

  3. 4

  4. 11
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern involves subtracting consecutive odd number squares: 109 - 35 = 74 (35 not a perfect square), but looking closely: 109 - 35 = 74, 74 - 28 = 46, 46 - 21 = 25, 25 - 14 = 11. The differences 35, 28, 21, 14 decrease by 7 each time. Next difference should be 7, so 11 - 7 = 4.

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