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Math Help - problem of methos of difference

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    problem of methos of difference

    i need help on this question. i cant get the ans finally.(i did the working outside) where's my mistake and how should i proceed?problem of methos of difference-dsc_0001-6-1-.jpgproblem of methos of difference-dsc_0002-4-1-.jpg
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    Re: problem of methos of difference

    Quote Originally Posted by delso View Post
    i need help on this question. i cant get the ans finally.(i did the working outside) where's my mistake and how should i proceed?Click image for larger version. 

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    I didn't look at this in great detail, but what is r? It shows up in your summation but not in the expression being summed up. If I had to guess I'd say that one of your sums should be:
    \sum_{r = 1}^n \frac{1}{r + 2} \neq \frac{1}{n + 2}

    -Dan
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