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  5. Comparing Quantities

7th Class Mathematics Comparing Quantities Question Bank Self Test-7

  • question_answer
    If b is mean proportion between a and c, then \[\frac{{{a}^{2}}-{{b}^{2}}+{{c}^{2}}}{{{a}^{-2}}-{{b}^{-2}}+{{c}^{-2}}}\] is equal to:

    A) \[~{{b}^{4}}\]          

    B)  \[{{a}^{3}}{{b}^{2}}\]          

    C)  \[{{a}^{2}}{{b}^{2}}{{c}^{2}}\]      

    D)  \[{{a}^{2}}bc\]

    E)             None of these

    Correct Answer: A

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