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diff --git a/2498/CH6/EX6.4/ex6_4.sce b/2498/CH6/EX6.4/ex6_4.sce
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+// Exa 6.4
+clc;
+clear;
+close;
+format('v',6)
+// Given data
+R1 = 1;// in k ohm
+R_F = 4.7;// in k ohm
+//The closed loop voltage gain, Ao = Vo/Vin = -R_F/R1;
+Ao = -R_F/R1;
+disp(Ao,"The closed loop voltage gain is");
+// The input impedance 
+Ri = R1;// in k ohm
+disp(Ri,"The input impedance in k ohm is");