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Oh I see. So this [itex]\lim_{N\to\infty}S_{N}=S[/itex] is something about a limit. Realy great to learn about this. I didn't know about this. Actualy I haven't done this yet. Ok I get it now.

ok arildno I get it upto here without any problem. Now my next step will be?

ok arildno I get it upto here without any problem. Now my next step will be?

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