9. Determine whether the series is absolutely or conditionally convergent or divergent: (−1)" n’ – n-1 10 7n + 2 α. Σε1" 2n + n+1 n=l a. Σ(-1)" n=1 b. Σ n=1 vn c. Σ(-1)"5" n=0 1

Q: #25 c and d

A: 25.   c.

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