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Hello, all,

I know this is quite annoying to post two questions within the same week, but I must say this is the best method I can think of when all possibilities in my brain ran out...

So, this time the question is about series. I have learned it last week in the Mathematical Methods course, the only two clues teacher left me is the formulae of determining the sum of standard arithematic progression and geometric progression. Anyway, in the problem sheet, I am being asked to find a general formula of the [tex] \sum {r^2} [/tex]~~ and also [tex] \sum {r^3} [/tex] as well....

I have tried the two model methods about A.P. and G.P., but it just cannot simplifies the question down.

Maybe this is just a question asks me to try all the possibilities, :uhh: I will try them, but also will expects all sorts of help from the forum as well.

All right, cheers~

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# A series question with r^2

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