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+// Exa 1.17
+clc;
+clear;
+close;
+// Given data
+ni= 1.8*10^16;// in /m^3
+q= 1.6*10^-19;// in C
+em=0.14;// electron mobility in m^2/v-sec
+hm=0.05;// hole mobility in m^2/v-sec
+resistivity= 1.2;// in Ωm
+n= 1/(q*em*resistivity);// in /m^3
+disp(n,"The electron concenration in /m^3 is :")
+p= ni^2/n;// in /m^3
+disp(p,"The hole concentration in /m^3 is : ")