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Railways R.R.C. (Patna) Solved Paper Held on 1st Shift 2-11-2014

  • question_answer
    If\[If\sqrt{2401}=\sqrt{{{7}^{x}},}then\,\,x=?\]

    A) 4                     

    B) 2

    C) 6                                 

    D) 8

    Correct Answer: A

    Solution :

    \[\sqrt{2401}=\sqrt{{{7}^{2}}}\]                         \[2401={{7}^{x}}\] \[{{7}^{x}}={{7}^{4}}\] \[x=4\]


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