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//Example 4.7
//MAXIMA SCILAB TOOLBOX REQUIRED FOR THIS PROGRAM
clear;
clc ;
close ;
syms n z;
f1=(1/2)^n;
F1= symsum (f1*(z^(-n)),n ,0, %inf );
f2=(1/3)^n;
F2= symsum (f2*(z^(-n)),n ,0,%inf );
//Display the result in command window
F=F1+F2; //linearity property
disp (F,"Z-transform of f(n) is:");
disp('ROC is the Region mod(z) > (1/2) ')
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