JEE Main & Advanced Mathematics Sequence & Series Question Bank Exponential series

  • question_answer
    \[1+x{{\log }_{e}}a+\frac{{{x}^{2}}}{2\,!}{{({{\log }_{e}}a)}^{2}}+\frac{{{x}^{3}}}{3\,!}{{({{\log }_{e}}a)}^{3}}+...=\] [EAMCET 2002]

    A) \[{{a}^{x}}\]

    B) x

    C) \[{{a}^{{{\log }_{a}}x}}\]

    D) a

    Correct Answer: A

    Solution :

      Series = \[1+x{{\log }_{e}}a+\frac{{{x}^{2}}}{2!}{{\left[ {{\log }_{e}}a \right]}^{2}}+\frac{{{x}^{3}}}{3!}{{[{{\log }_{e}}a]}^{3}}+...\] \[={{e}^{x{{\log }_{e}}a}}={{e}^{{{\log }_{e}}{{a}^{x}}}}={{a}^{x}}\].


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