Hi, I've been doing an assignment for university and one of the questions is (sum from r=1 to infinity). I've searched all through my notes and on the internet but I can't find the answer anywhere! Help would be appreciated!
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You can use ratio test.
I'm not trying to find whether or not it converges, I need to evaluate it. Unless the ratio test you mentioned is another one to the one I'm thinking of?
To evaluate it, write r(r-2)(r-1)+2r(r-1)+r^2=r(r-1)(r-2)+2r(r-1)+r(r-1)+r" alt="r^3=r^2(r-1)+r^2=r(r-2)(r-1)+2r(r-1)+r^2=r(r-1)(r-2)+2r(r-1)+r(r-1)+r" />.
Okay, I will try that. Thank you!
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