Which of the following series converge a k 2 1 k ln k

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Which of the following series converge?k= 21B. Since the series has the formk= 1ak,ak=5k3k+ 1k,use of the Root Test is suggested. For thenlimk→ ∞A.k(lnk)2+ 3kB.k= 15k3k+ 1k1.neither of them2.A onlycorrect3.both of them4.B onlyExplanation:A. We use the limit comparison test, com-paring the given seriesk= 21
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