La Serie Alternante

\sum_{n=1}^{∞ }{\frac{(-1)^{n+1}}{n} }= ln2

k = 2 (slider from 1 to 5501, step 1)
geometrica = Sequence(((-1)^(n + 1) * 1 / n), n, 1, k)
a = Sum(geometrica)
texto1: "\sum_{n=1}^{" + (LaTeX[k]) + "}{\frac{(-1)^{n+1}}{n} }=" + (LaTeX[a]) + ""