I'm totally lost on this problem..any help is appreciated. I have to rewritethe sum replacing the index i by k, where i=k +1.
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N(upperlimit)
[sigma notation] [/FONT]i^2* r^n-1 (to right of sigma notation)
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i=1(lower limit) [/FONT]
[FONT="]
N(upperlimit)
[sigma notation] [/FONT]i^2* r^n-1 (to right of sigma notation)
[FONT="]
i=1(lower limit) [/FONT]