Problem 3. Apply the alternating series test to the following two series. What can you conclude about the series based on the test? (a): E(-1) " Vn 2n + 3 n=1 (b) : arctan (n) n=1Problem 4. Determine whether the following series are absolutely convergcnt, conditionally convergent, or divergent. (a): co _1 n :2 11371 ('3')