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Homework Help: Cal 2 ratio test where is my mistake

  1. Nov 5, 2009 #1
    cal 2 ratio test "where is my mistake"

    1. The problem statement, all variables and given/known data
    I attached a pic
    I solved the problem but i get 4^1 and the book says 4^2 I dont know why?

    2. Relevant equations

    http://img690.imageshack.us/img690/1518/problem15.jpg [Broken]

    3. The attempt at a solution
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 5, 2009 #2


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    Homework Helper

    Re: cal 2 ratio test "where is my mistake"

    when you sub in for n -> n+1 in exponent of the 4 it should be

    [tex] \frac{4^{(2n+1)}}{4^{(2(n+1)+1)}}[/tex]
  4. Nov 6, 2009 #3
    Re: cal 2 ratio test "where is my mistake"

    got it

    thank you
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