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Infinite Seriesmedium
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For the Limit Comparison Test applied to ∑n=3∞n3+2nn5−4n+1\sum_{n=3}^{\infty} \frac{n^3 + 2n}{n^5 - 4n + 1}∑n=3∞​n5−4n+1n3+2n​, which comparison series ∑bn\sum b_n∑bn​ is most appropriate?