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diff --git a/758/CH4/EX4.2/Ex_4_2.sce b/758/CH4/EX4.2/Ex_4_2.sce
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+//Example 4.2

+

+clc;clear;close;

+z=poly(0,'z');

+x1=[3 1 2 5 7 0 1];n1=-3:3;

+X1=x1*(z^-n1)';

+x2=[2 4 5 7 0 1 2];n2=-2:4;

+X2=x2*(z^-n2)';

+x3=[1 2 5 4 0 1]; n3=0:5;

+X3=x3*(z^-n3)';

+x4=[0 0 1 2 5 4 0 1];n4=0:7;

+X4=x4*(z^-n4)';

+X5=z^0;

+X6=z^-5;

+X7=z^5;

+disp(X1,'x1(n)={3,1,2,5,7,0,1} X1(z)=');

+disp(X2,'x2(n)={2,4,5,7,0,1,2} X2(z)=');

+disp(X3,'x3(n)={1,2,5,4,0,1} X3(z)=');

+disp(X4,'x4(n)={0,0,1,2,5,4,0,1} X4(z)=');

+disp(X5,'x5(n)=delta(n) X5(z)=');

+disp(X6,'x6(n)=delta(n-5) X6(z)=');

+disp(X7,'x7(n)=delta(n+5) X7(z)=');
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