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diff --git a/67/CH1/EX1.19.a/example119a.sce b/67/CH1/EX1.19.a/example119a.sce
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+//Example 1.19a
+clc;
+x1=[1,1,1,1]
+x2=[2,2,2,2]
+a=1
+b=1
+for t=1:length(x1)
+    x3(t)=a*x1(t)+b*x2(t)
+end
+for t=1:length(x1)
+    y1(t)=t*x1(t)
+    y2(t)=t*x2(t)
+    y3(t)=t*x3(t)
+end
+for t=1:length(y1)
+    z(t)=a*y1(t)+b*y2(t)
+end
+count=0
+for n=1:length(y1)
+    if(y3(t)==z(t))
+        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
+\ No newline at end of file