Multiple choice

Find the wrong term in the following number series. 169 155 180 136 191 125

  1. 191

  2. 125

  3. 169

  4. 180

  5. 155
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E Correct answer
Explanation

The series alternates between subtracting and adding: 169-155=14, 155+180=335 (doesn't fit), 180-136=44, 136+191=327, 191-125=66. Looking at odd positions: 169, 180, 191 (add 11, then 11). Even positions: 155, 136, 125 (subtract 19, then 11, doesn't fit). 155 breaks the pattern as even-position terms should be 155-19=136, 136-19=117, not 125.

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