I. Consider the series -. n=1 (a) Using the ratio test, determine a real number R such that the series converges for al z R (called the radius of convergence of the series). (b) Does the series converge for -R? I. Consider the series -. n=1 (a) Using the ratio test, determine a real number R such that the series converges for al z R (called the radius of convergence of the series). (b) Does the series converge for -R