initial commit / add all books

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diff --git a/67/CH2/EX2.25/example225.sce b/67/CH2/EX2.25/example225.sce
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+//Example 2.25

+clc;

+x1=[1,1,1,1]

+x2=[2,2,2,2]

+a=1

+b=1

+for n=1:length(x1)

+    x3(n)=a*x1(n)+b*x2(n)

+end

+for n=1:length(x1)

+        y1(n)=x1(n)^2

+        y2(n)=x2(n)^2

+        y3(n)=x3(n)^2

+end

+for n=1:length(y1)

+    z(n)=a*y1(n)+b*y2(n)

+end

+count=0

+for n=1:length(y1)

+    if(y3(n)==z(n))

+        count=count+1;

+     end   

+end

+if(count==length(y3))

+disp('It satisfy the superposition principle');

+disp('THE GIVEN SYSTEM IS LINEAR ');

+else

+    disp('It does not satisfy superposition principle ');

+    disp('THE GIVEN SYSTEM IS NON LINEAR');

+end
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