4. Study the convergence of the following series: (a) (b) E n=1 (c) E(-1)n+1n² +2 n² + 1 n=1 nlog n (d) (log n)n n=2 Vn +I- Vn (e) E n=1 1 (f) > (In+1 - In) for any sequence (rn) n=1

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