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diff --git a/2288/CH3/EX3.21.6/ex3_21_6.sce b/2288/CH3/EX3.21.6/ex3_21_6.sce
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+// Exa 3.21.6
+clc;
+clear;
+close;
+// Given data
+Sigma = 0.1;// in (ohm-m)^-1
+Mu_n = 1300;
+n_i = 1.5 * 10^10;
+q = 1.6 * 10^-19;// in C
+n_n = Sigma/(Mu_n * q);// in electrons/cm^3
+disp(n_n*10^6,"The concentration of electrons per m^3 is");
+p_n = (n_i)^2/n_n;// in per cm^3
+p_n = p_n * 10^6;// in perm^3
+disp(p_n,"The concentration of holes per m^3 is");