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Railways R.R.C. (Mumbai) Solved Paper Held on 2-11-2014 - I

  • question_answer
    Find the value of \[2\sqrt{50}+\sqrt{18}-\sqrt{72}=\] \[\left( Given\sqrt{2}=1.414 \right)\]

    A) \[9-4\]               

    B) \[10-312\]

    C) \[9-898\]                       

    D) \[4-237\]

    Correct Answer: C

    Solution :

    \[2\sqrt{50}+\sqrt{18}-\sqrt{72}\] \[=10\sqrt{2}+3\sqrt{2}-6\sqrt{2}\] \[=13\sqrt{2}-6\sqrt{2}\] \[=7\sqrt{2}\] \[=7\times 1.414\] \[=9.898\]


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