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diff --git a/1319/CH1/EX1.28/1_28.sce b/1319/CH1/EX1.28/1_28.sce
new file mode 100644
index 000000000..39f698011
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+//Determine the inductance of a three coil system
+
+clc;
+clear;
+//Self inductances of A B C
+L1=25;
+L2=30;
+L3=35;
+
+//Mutual inductances of AB BC CA
+M12=10;//Flux assist each other
+M23=-15;//Flux oppose each other
+M31=-10;//Flux oppose each other
+
+La=L1+M12+M31;
+Lb=L2+M12+M23;
+Lc=L3+M31+M23;
+
+Leq=1/(((La*Lb)+(Lb*Lc)+(Lc*La))/(La*Lb*Lc));
+
+printf('The equivalent inductance for a three coil system = %g H\n',Leq)