Multiple choice

Find the wrong term in the following number series-(\newline)23()()()()()26()()()()41()()()()()76()()()()()139()()()()()248

  1. 41

  2. 26

  3. 20

  4. 248
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Consecutive differences: 26-23=3, 41-26=15, 76-41=35, 139-76=63, 248-139=109. Pattern in differences: 3, 15, 35, 63, 109. These follow: 3=1×3, 15=3×5, 35=5×7, 63=7×9, 109=11×11 (breaks pattern). Should be 9×11=99, giving 139+99=238. Or differences increase by 12, 20, 28, 36, 44... 3, 15, 35, 63, 99... giving terms 23, 26, 41, 76, 139, 238. 248 is wrong.

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