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9th Class Mathematics Number System and its Operations Question Bank Number System

  • question_answer
    \[({{5}^{61}}+{{5}^{62}}+{{5}^{63}})\]is divisible by

    A)  31       

    B)  11

    C)  13                               

    D)  17

    Correct Answer: A

    Solution :

    (a): \[{{5}^{61}}+{{5}^{62}}+{{5}^{63}}={{5}^{61}}(1+5+{{5}^{2}})={{5}^{61}}\times 31\] which is divisible by 3.                            


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