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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-18

  • question_answer
    Three of the following four are alike in a certain way and so form a group. Which is the one that does not belong to that group?

    A)  143                             

    B)  63                               

    C)  257                   

    D)         15                               

    Correct Answer: C

    Solution :

    The given numbers can be written as follows: \[143={{12}^{2}}-1;\text{ }63={{8}^{2}}-1;\text{ }195={{14}^{2}}-1;\] \[15={{4}^{2}}-1\] But, \[257={{16}^{2}}+1\] Obviously, except 257, others can be written in the form \[{{x}^{2}}-1\].


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