- #1
jisbon
- 476
- 30
- Homework Statement
- Show that summation of r^n+2r^n+3r^n+...nr^n is less than r/(1-r^3) for n more than one.
- Relevant Equations
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So this seems to be a geometric Series, but with the coefficients in front, how do I exactly go about proving this?
Thanks
Thanks