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

  • question_answer
    The value of \[1-\log 2+\frac{{{(\log 2)}^{2}}}{2\,!}-\frac{{{(\log 2)}^{3}}}{3\,!}+....\]  is   [MP PET 1998; Pb. CET 2000]

    A) 2

    B) \[\frac{1}{2}\]

    C) \[\log 3\]

    D) None of these

    Correct Answer: B

    Solution :

    Given series =\[1-\log 2+\frac{{{(\log 2)}^{2}}}{2!}-\frac{{{(\log 3)}^{3}}}{3!}+....\] \[={{e}^{-\log 2}}={{e}^{\log \left( \frac{1}{2} \right)}}\]\[=\frac{1}{2}\].


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