(1 point) Consider the series 8 an = (x - 5)3 4 ( x - 5) 6 (x - 5)9 + + (x - 5)12 + ... 3 . 2! 9 . 3! 27 . 4! n=no Find an expression for an . an = In the summation formula n starts at n = no . What is your starting index no ? no = (Note that because the validity of either of your answers depends on the other, if you enter only one, both will be marked wrong.)(1 point) Use the ratio test to find the radius of convergence of the power series R: (if the radius is infinite, enter inf for R.)