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10th Class Mental Ability Series Completion Question Bank Series Completion

  • question_answer
    Find the missing letters ab, ba, abc, cba, abed,.....

    A)  acbd                                    

    B)  bacd

    C)  cabd                                    

    D)  dcba  

    Correct Answer: D

    Solution :

     The pattern is \[^{1}{{a}^{2}}b.{{\,}^{2}}{{b}^{1}}a.{{\,}^{1}}{{a}^{2}}{{b}^{3}}c.{{\,}^{3}}{{c}^{2}}{{b}^{1}}a,{{\,}^{1}}{{a}^{2}}{{b}^{3}}{{c}^{4}}d,{{\,}^{4}}{{d}^{3}}{{c}^{2}}{{b}^{1}}a,...\] \[\therefore \] Missing letters \[=dcba.\]


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