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12th Class Mental Ability Series Question Bank Question - Ranking Missing Character

  • question_answer
    Direction: In each of the following questions, identify the wrong numbers in the series. 9, 19, 40, 83, 170, 340

    A) 83

    B) 40

    C) 340

    D) 170

    Correct Answer: C

    Solution :

    \[9\,\,\times \,\,2\,\,+\,\,1\,\,=\,\,18\,\,+\,\,1\,\,=\,\,19\] \[19\,\,\times \,\,2\,\,+\,\,2\,\,\,=\,\,38\,\,+\,\,2\,\,\,=\,\,40\] \[40\,\,\times \,\,2\,\,+\,\,3\,\,=\,\,80\,\,+\,\,3\,\,=\,\,83\] \[~83\,\,\times \,\,2\,\,+\,\,4\,\,=\,\,166\,\,+\,\,4\,\,=\,\,170\] \[170\,\,\times \,\,2\,\,+\,\,5\,\,=\,\,340\,\,+\,\,5\,\,=\,\,\] Therefore, the number 340 is wrong in the series.


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