4. Determing whether the following series are absolutely convergent, conditionally convergent, or diver- gent. Explain your decision. (a) Find the interval of convergence for the following: "4 n=0 (b) Determine whether the alternating series converges or diverges by using the alternating series test: 2n (-1)-4-3 (c) Use the ratio test to determine whether the series is absolutely convergent, conditionally conver- gent, or divergent: (-1)