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+//Ex 1.40.9
+clc;clear;close;
+format('v',9);
+
+//Given :
+ni=10^16;//per m^3
+ND=10^22;//per m^3
+n=ND;//per m^3//ND>>ni
+disp(n,"Electron concentration(per m^3) : ");
+p=ni^2/n;//per m^3
+disp(p,"Electron concentration(per m^3) : ");