Given a pow sies <span class="katex-r" data-latex="displaystyle sum_{n=1}^{∞} ac{x^n}{n(n+1)}"></span>.1. F∈d the radius of convgence <span class="katex-r" data-latex="displaystyle R"></span> of the pow sies.2. Detm∈e the sum of the pow sies f <span class="katex-r" data-latex="displaystyle x ∈ (-R, R)"></span>.