Question

3. Do the following series converge absolutely or converge conditionally? Write one sentence to explain your answer, and specify which test you used [3 marks each]. \text { (a) } \sum_{n=2}^{\infty} \frac{(-1)^{n}}{n-1} \text { (b) } \sum_{n=1}^{\infty} \frac{(-1)^{n+1}}{n \sqrt{n}}

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