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Question Number 194466 by horsebrand11 last updated on 08/Jul/23
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Answered by cortano12 last updated on 08/Jul/23
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Answered by witcher3 last updated on 08/Jul/23
e∑nk=1ln(1+1n(1+kn))ln(1+1n(1+kn))=1n(1+kn)−12n2(1+kn)2+o(1n2)∑nk=112n2(1+kn)2⩽12n∑nk=11n(1+kn)2<12n∫01(1+x)2dx=1n(83−13)=O(1n)Σln(1+1n(1+kn))=∑nk=11n(1+kn)+O(1n)⇒limn→∞∑nk=1ln(1+1n(1+kn))=∑nk=11n(1+kn)=∫01(1+x)dx=32limn→∞∏nk=1(1+1n+kn2)=e32
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