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+//Ex1.18
+clc
+micro_p = 1800 //hole mobility
+rho_p = 1 //resistivity
+e = 1.6*10^-19 //electorn charge
+disp("micro_p ="+string(micro_p)+" cm.sq/V-s")
+disp("rho_p = "+string(rho_p)+"ohm-cm")
+disp("e = "+string(e)+"C")
+disp("pp = 1/(e*micro_p*rho_p) = "+string(1/(e*micro_p*rho_p))+" holes/cm.cube") //number of trivalent impurity