(1 point) Book Problem 7 The following series are geometric series. Determine whether each series converges or not. For the convergent series, enter the sum of the series. For the divergent series, enter DIV Also for each series, enter the first term a and the common ratio r. 00 (a) , a and T = n=1 1 (b) , and r 71 2 00 (-2)n-1 (C) 77-1 and r