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// Exa 3.21.11
clc;
clear;
close;
// Given data
n_i = 1.5 * 10^10;// in per cm^3
n_n = 2.25 * 10^15;// in per cm^3
p_n = (n_i)^2/n_n;// in per cm^3
disp(p_n,"The equilibrium electron density per cm^3 is");
h_n = n_n;// in cm^3
disp(h_n,"Hole density in per cm^3 is");