7. [15 marks] Determine whether the series is absolutely convergent, conditionally convergent, or divergent. a. (5 marks) 0 2 _ Tl 21H)" 12" n: b. (5 marks) (1)\"+1 (205471 2 1 + n2 c. (5 marks) 00 1 Emma 11:1 8. [18 marks] Find the radius of convergence and the interval of convergence for the series. a. (6 marks) on n x 2 571712 71:1 b. (6 marks) 00 (_1)nx2n (2n)! 11:1 c. (6 marks) 2"(x 2)n 471 + 1 71:1