La Serie del Logaritmo Natural

\sum_{n=1}^{ ∞}{ (-1)^{n+1}}\frac{x^{n}}{n}=ln(1+x)

Si -1<x<1

k = 6 (slider from 1 to 100, step 1)
logaritmo = Sequence(((-1)^(n + 1) * x^(n) / n), n, 1, k)
a = Sum(logaritmo)
texto5: "\sum_{n=1}^{" + (LaTeX[k]) + "}{ (-1)^{n+1}}\frac{x^{n}}{n}"
f(x) = log(1 + x)