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diff --git a/3556/CH3/EX3.4/Ex3_4.sce b/3556/CH3/EX3.4/Ex3_4.sce
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+clc
+// Fundamental of Electric Circuit 
+// Charles K. Alexander and  Matthew N.O Sadiku  
+// Mc Graw Hill of New York 
+// 5th Edition 
+
+// Part 1   :  DC Circuits 
+// Chapter 3:  Methods of Analysis
+// Example 3 - 4
+
+clear; clc; close; 
+//
+// Given data
+A  = [3.00  -1.00  -2.00; 
+      6.00  -1.00  -2.00;
+      6.00  -5.00  -16.00];     
+A1 = [0.00  -1.00  -2.00; 
+     80.00  -1.00  -2.00;
+     40.00  -5.00  -16.00];     
+A3 = [3.00   0.00  -2.00; 
+      6.00  80.00  -2.00;
+      6.00  40.00  -16.00];     
+A4  = [3.00  -1.00   0.00; 
+      6.00  -1.00  80.00;
+      6.00  -5.00  40.00];      
+// Calculations
+// Calculations V1, V2, V3 and V4  
+V1 = det(A1)/det(A);           
+V2 = V1 - 20.00;                
+V3 = det(A3)/det(A);            
+V4 = det(A4)/det(A);           
+//
+// Display the result
+disp("Example 3-4 Solution : ");
+printf(" \n V1  = Voltage at Node 1        = %.3f Volt",V1)
+printf(" \n V2  = Voltage at Node 2        = %.3f Volt",V2)
+printf(" \n V3  = Voltage at Node 3        = %.3f Volt",V3)
+printf(" \n V4  = Voltage at Node 4        = %.3f Volt",V4)