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Math Help - Progression Sum

  1. #1
    Newbie findmehere.genius's Avatar
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    India, UP
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    Progression Sum

    The question states:
    what would be sum of
    1+1/3^2 +(1*4)/((1*2)*3^4) +(1*4*7)/((1*2*3)*3^6) +......

    and since the question is multiple choice type:
    a) (3/2)^(1/2) 3/2 power 1/2
    b) (3/2)^(1/3) 3/2 power 1/3
    c) (1/3)^(1/2) 1/3 power 1/2
    d) 1/2^(1/2) 1/ root 2


    My head is boggled....question came in test...took a lot of my time even at home, plz help.
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  2. #2
    Super Member General's Avatar
    Joined
    Jan 2010
    From
    Kuwait
    Posts
    562
    Quote Originally Posted by findmehere.genius View Post
    The question states:
    what would be sum of
    1+1/3^2 +(1*4)/((1*2)*3^4) +(1*4*7)/((1*2*3)*3^6) +......

    and since the question is multiple choice type:
    a) (3/2)^(1/2) 3/2 power 1/2
    b) (3/2)^(1/3) 3/2 power 1/3
    c) (1/3)^(1/2) 1/3 power 1/2
    d) 1/2^(1/2) 1/ root 2


    My head is boggled....question came in test...took a lot of my time even at home, plz help.
    Are you mean this?:
    1+\frac{1}{3^2}+\frac{(1)(4)}{(1)(2)(3^4)}+\frac{(  1)(4)(7)}{(1)(2)(3)(3^6)}+.....
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