Multiple choice

In the following number series, a wrong number is given. Find out that wrong number. 9 11 37 191 1354 10841

  1. 1354

  2. 191

  3. 37

  4. 11

  5. 9
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A Correct answer
Explanation

The pattern is n × 2 + (sum of digits of n): 9×2+9=27, 27×2+(2+7)=54+9=63, 63×2+(6+3)=126+9=135, 135×2+(1+3+5)=270+9=279, 279×2+(2+7+9)=558+18=576. The series should be 9, 27, 63, 135, 279, 576. The given 191 breaks the pattern, and 1354 is also incorrect (should be 135). The wrong number is 1354.

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