Question
4. (12 points) Determine whether the series listed below are convergent or divergent. Give the sums of the convergent series. \text { a. } \sum_{i=1}^{\infty} \frac{e^{i}}{3^{i-2}} \text { b. } \sum_{n=1}^{\infty} \frac{4}{n^{2}+4 n+3}+\frac{3^{n-1}}{4^{n}} \text { c. } \sum_{k=1} \ln \left(\frac{n}{n+3}\right) \text
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