Question Number 130381 by Bird last updated on 24/Jan/21
$${calculate}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{{x}^{{n}} }{{n}^{\mathrm{2}} } \\ $$$${find}\:{first}\:{radius}\:{of}\:{convergence} \\ $$
calculate-n-1-x-n-n-2-find-first-radius-of-convergence-