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x11+x22+x33+x44+…\large \frac{x^1}{1}+\frac{x^2}{2}+\frac{x^3}{3}+\frac{x^4}{4}+\ldots1x1+2x2+3x3+4x4+…
Find the closed form of the sum above, where −1≤x<1-1≤x<1−1≤x<1.
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