Multiple choice

Directions: In the following number series, only one is wrong. Find out the wrong number. 139, 140, 144, 156, 169, 194, 230

  1. 140

  2. 144

  3. 156

  4. 169

  5. 230
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C Correct answer
Explanation

The differences between consecutive terms in the series should be consecutive perfect squares: +1^2, +2^2, +3^2, +4^2, and so on. Adding 9 (which is 3^2) to 144 should give 153 instead of 156, which then correctly leads to 153 + 16 = 169.

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