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Railways R.R.C. (Kolkata) Solved Paper Held on 17-11-2013

  • question_answer
    \[\frac{0.87\times 0.87\times 0.87+0.13\times 0.13\times 0.13}{0.87\times 0.87-0.87\times 0.13+0.13\times 0.13}=?\]

    A) 0.13                             

    B) 0.74

    C) 0.9                               

    D) 1

    Correct Answer: D

    Solution :

    \[\frac{{{(0.87)}^{3}}+{{(0.13)}^{3}}}{{{(0.87)}^{2}}-0.87\times 0.13+{{(0.13)}^{2}}}\] \[=0.87+0.13\] \[=1.00\]


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