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+// Exa 1.3
+clc;
+clear;
+close;
+// Given data
+format('v',13)
+N_D= 6*10^18;// in per cube cm
+N_A= 3*10^15;// in per cube cm
+ni= 2.5*10^12;
+Nn= N_D-N_A;// in per cube cm
+rho_n= ni^2/Nn;// in per cube cm
+// Part (i)
+disp(rho_n,"The concentration of holes in n-type in per cm^3 is : ")
+disp(Nn,"Concentration  of electrons in n-type in per cm^3 is : ")
+// Part (ii)
+disp("The material is of n-type")