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diff --git a/1850/CH1/EX1.20/exa_1_20.sce b/1850/CH1/EX1.20/exa_1_20.sce
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+// Exa 1.20
+clc;
+clear;
+close;
+// Given data
+format('v',7)
+V_BE=0.7;// in volt
+V_CC=5;// in volt
+V_EE=-5;// in volt
+Bita=100;
+R=18.6;// in k ohm
+R= R*10^3;// in ohm
+I2= (V_CC-V_BE-V_EE)/R;// in amp
+I_C3=I2;
+I_E= I_C3/2;// in amp
+re_desh= (26*10^-3)/I_E;// in ohm
+re1_desh=re_desh;
+re2_desh=re1_desh;
+R_in1= 2*Bita*re_desh;// in ohm
+R_in2= R_in1
+disp(R_in1*10^-3,"Differential input resistance in k ohm")