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JEE Main & Advanced Mathematics Sequence & Series Question Bank Numerical Value Type Questions - Sequences and Series

  • question_answer
    The sum \[\sum\limits_{k=1}^{20}{k\frac{1}{{{2}^{k}}}}\] is equal to \[2-\frac{k}{{{2}^{19}}},\] then k is

    Answer:

    11


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