Изменения

<center><tex>G(z) = 4\sum_{n=0}^{\infty}z^n + 3\sum_{n=0}^{\infty}n2^{n......-1}z^n-\sum_{n=0}^{\infty}(n+1)2^nzn z^n+5\sum_{n=0}^{\infty}3^nzn z^n.\end{displaymath}</tex></center> 

\begin{displaymath}<center><tex>[z^n]G(z) = 5\cdot3^n + 3n2^{n-1} - (n+1)2^n+4= 5\cdot3^n+n2^{n-1}-2^n+4.\end{displaymath}</tex>и\begin{displaymath}<tex>