a. Write the series using sigma notation: 1i+1+ i: 3 9 27 81 'FD b. The sum of a series is defined as the limit of the sequence of partial sums, {Sn}, which means 1 1 1 1 e() c. Select all true statements (there may be more than one correct answer): "' A. The series is a p-series. 'i' B. The series converges. '_' C. The series is a telescoping series (i.e., it is like a collapsible telescope). 'i' D. The series is an alternating series. "' E. The series is a geometric series