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OpenStudy (anonymous):
What is the limit in this example? Lim (x+x^2+x^3+....+x^n-n)/(x-1) When X->1 ???
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OpenStudy (anonymous):
Try rewriting the numerator as (x-1) + (x^2-1) + ... + (x^n - 1).
OpenStudy (anonymous):
i tried but i only reemplace X?
OpenStudy (anonymous):
i cant add -1 unless i add +1 :S because u cant add numbers like that or not?
OpenStudy (anonymous):
There is a -n at the end, you are just splitting that into n -1s.
OpenStudy (a_clan):
take (x-1) out as common in numerator and cancel from denominator
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OpenStudy (anonymous):
i can do that? i mean i tried but my friend said that i cant do that
OpenStudy (a_clan):
of course you can
OpenStudy (anonymous):
\[ \frac {x^k - 1} {x-1} = (1 + x + ... + x^{k-1} ) \]
OpenStudy (anonymous):
\[(x-1)/(x-1)+(x^2-1)/(x-1)+(x^3-1)/(x-1)+...+(x^n-1)/(x-1)\] Then apply the limit...
OpenStudy (anonymous):
x^k?? shouldn't that be x? so i can cancel it?
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OpenStudy (anonymous):
which will come as 1+2+3+...+n
OpenStudy (anonymous):
got it clauixx?
OpenStudy (anonymous):
yes :D thanks :D:D
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