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25-28 Determine whether the series is convergent or divergent by expressing sn as a telescoping sum (as in Example 6). If it is convergent, find its sum. 25. ∑ n=2 ∞ 2 n 2 − 1 26. ∑ n = 1 ∞ ln ⁡ n n + 1 27. ∑ n = 1 ∞ 3 n(n + 3) 28. ∑ n=1 ∞ ( e 1/n − e 1/(n + 1))

25-28 Determine whether the series is convergent or divergent by expressing sn as a telescoping sum (as in Example 6). If it is convergent, find its sum. 25. ∑ n=2 ∞ 2 n 2 − 1 26. ∑ n = 1 ∞ ln ⁡ n n + 1 27. ∑ n = 1 ∞ 3 n(n + 3) 28. ∑ n=1 ∞ ( e 1/n − e 1/(n + 1))

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25-28 - Determine whether the series is convergent or divergent by expressing s n as a telescoping sum (as in Example 6). If it is convergent, find its sum.
25. ∑ n = 2 ∞ 2 n 2 − 1
26. ∑ n = 1 ∞ ln ⁡ n n + 1
27. ∑ n = 1 ∞ 3 n ( n + 3 )
28. ∑ n = 1 ∞ ( e 1 / n − e 1 / ( n + 1 ) )

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