Consider the series

${\displaystyle \underset{n=4}{\overset{}{}}}{a}_n-(x-5{)}^2\frac{(x-5{)}^6}{3-2!}\frac{(x-5{)}^2}{9-3!}\frac{(x-5{)}^{12}}{27-4!}$ cdots

Find an expression for $a_2.$

$a_n=$

In the summation formula $n$ starts at $n-n_0.$ What is your starting indes no$?$

$m_p=$

$($Nofe that because the validity of either of your answers depends an the elther, if you anter any one, both will be marked wrong.$)$