$\begin{array}{1 1}\large\frac{5}{81}\big[10^{n+1}-10+9n\big] \\ \large\frac{5}{81}\big[10^{n+1}-10-n\big] \\ \large\frac{5}{81}\big[10^{n+1}-10-9n\big]\large\frac{5}{81}\big[10^{n}-10-9n\big] \\ \end{array} $

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