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+// Exa 5.21.1
+clc;
+clear;
+close;
+// Given data
+O_V = 5;// output voltage in V
+V_D = 1.5;//voltage drop in V
+R = (O_V - V_D)/O_V;
+R = R * 10^3;// in ohm
+disp(R,"The resistance value in Ω is");
+disp("As this is not standard value, use R=680 Ω which is a standard value")