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SSC Sample Paper SSC CGL - Sample Paper-19

  • question_answer
    The square root of \[({{272}^{2}}-{{128}^{2}})\] is

    A) 256                              

    B) 8

    C) 240                  

    D) 1.44

    Correct Answer: C

    Solution :

    \[\sqrt{{{(272)}^{2}}-{{(128)}^{2}}}\] \[=\sqrt{(272-128)(272+128)}\]             \[=\sqrt{144\times 400}\]             \[=\sqrt{12\times 12\times 20\times 20}\]             \[=12\times 20=240\]    


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