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+//Example number 9.1, Page number 202
+
+clc;clear;
+close;
+
+//Variable declaration
+e=1.6*10**-19; //charge(c)
+ni=2.4*10**19; //particle density(per m**3)
+mew_e=0.39; //electron mobility(m**2/Vs)
+mew_h=0.19; //hole mobility(m**2/Vs)
+//Calculation
+rho=1/(ni*e*(mew_e+mew_h)); //resistivity(ohm m)
+//Result
+printf("resistivity is %.5f ohm-m",rho)