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8th Class Mathematics Rational Numbers Question Bank Numbers

  • question_answer
    If x, y, z, are positive real number and a, b, c are rational numbers, then the value of \[\frac{1}{1+{{x}^{b-a}}+{{x}^{c-a}}}+\frac{1}{1+{{x}^{a-b}}+{{x}^{c-b}}}+\frac{1}{1+{{x}^{b-c}}+{{x}^{a-c}}}\]is

    A)  \[-1\]                          

    B) 1

    C) 0                                 

    D) none of these

    Correct Answer: B

    Solution :

     \[0.\overline{387}=387/999\] \[0.74\overline{35}=\frac{7435-74}{9900}=\frac{7361}{9900},\]  \[W=N\cup \{0\}\] \[N\subseteq W\]


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