Find a recurrence formula for the power series solution's coefficient about Xo $=1$ to y$"-20$ xy $-9$ y $=0.17$ Correct Mart $2010$ out of $200$ Flag oution $$ ento $0220($n$+1)-1($n$+1)($n$+2)216($n$+1)\mathrm{.}1+(16$n $+20)$ an $($n$+1)+2)20($n $+1)...+(20$n $+9)$ an $($n$+1)+220($n$+1).\mathrm{.}1(20$n $+9),$ in $+1$Xn$+2)$ None a $922$