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Math Help - stuck on some problems

  1. #1
    Junior Member
    Joined
    Apr 2009
    Posts
    30

    stuck on some problems

    1) Σ ne^-n

    i tiried the ratio test but i didnt get the correct answer.

    an=(2^n)/(1+n)

    this one im not to sure where to begin.

    please help me out.
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  2. #2
    Junior Member
    Joined
    Apr 2009
    Posts
    30
    i figured out the first one so if anyone could help me out with the second one it would really help.
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