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Question Number 130381 by Bird last updated on 24/Jan/21

calculate Σ_(n=1) ^∞ (x^n /n^2 ) find first radius of convergence

$${calculate}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{{x}^{{n}} }{{n}^{\mathrm{2}} } \\ $$$${find}\:{first}\:{radius}\:{of}\:{convergence} \\ $$

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