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Question Number 130382 by Bird last updated on 24/Jan/21
$${find}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{{x}^{{n}} }{{n}^{\mathrm{3}} } \\ $$$${determine}\:{first}\:{radius}\:{of}\:{convergence} \\ $$$$\left({xreal}\right) \\ $$