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+clc;
+//ex3.20
+Vin=20; //volt
+Vz=3.3; //volt
+Rs=1000; //ohm
+I=(Vin-Vz)/Rs; //Ampere
+IZK=0.003 //Ampere
+Ilmax=I-IZK; //Ampere
+RLmin=Vz/Ilmax; //ohm
+disp('ohm',RLmin,"RLmin="); //The answers vary due to round off error