Re: x + 2x^2 + 4x^3 + 8x^4 + ... + 2^(k-1)x^k
- From: Dave Dodson <dave_and_darla@xxxxxxxx>
- Date: Sat, 26 Apr 2008 06:44:09 -0700 (PDT)
On Apr 25, 3:43 pm, spasmous <spasm...@xxxxxxxxx> wrote:
Is anyone familiar with the MacLauren expansion x + 2x^2 + 4x^3 + 8x^4
+ ... + 2^(k-1)x^k ?
Call the sum S. Then what is 2xS - S?
Dave
.
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- From: spasmous
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