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11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-9

  • question_answer
    The foci of the ellipse \[\frac{{{x}^{2}}}{16}+\frac{{{y}^{2}}}{{{b}^{2}}=1}\] and the hyperbola \[\frac{{{x}^{2}}}{144}+\frac{{{y}^{2}}}{81}=\frac{1}{25}\] coincide. Then the value of \[{{b}^{2}}\]is

    A)  1                    

    B)  5             

    C)  7                    

    D)  9

    Correct Answer: C

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