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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-15

  • question_answer
    DIRECTION: In each as the following number series a wrong number is given. Find out that number.
    \[0\text{ }\,\,\,1\text{ }\,\,\,\,9\text{ }\,\,\text{ }3\,\,\,\,\,\,6\text{ }\,\,\,99\text{  }\,\,225\text{ }\,\,\,441\]

    A)  9                    

    B)  36                  

    C)         99                  

    D)         225                

    Correct Answer: C

    Solution :

    The differences are \[~1-0=1={{1}^{3}}\text{ };9-1=8\] \[={{2}^{3}};36-9=27={{3}^{3}};99-36=63\ne {{4}^{3}},\] but \[100-36=64={{4}^{3}};\] \[225-100=125={{5}^{3}};\] \[441-225=216={{6}^{3}}\]


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