Multiple choice

Find the wrong number in the following number series. 27 29 38 61 105 178 284

  1. 29

  2. 38

  3. 178

  4. 284

  5. 61
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C Correct answer
Explanation

Find the pattern by calculating differences between consecutive terms: 27→29 (+2), 29→38 (+9), 38→61 (+23), 61→105 (+44), 105→178 (+73), 178→284 (+106). The second differences are: 7, 14, 21, 29, 33. The pattern should be 7, 14, 21, 28, 35. The 73 after 105 breaks the pattern, so 178 is wrong.

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