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diff --git a/2288/CH3/EX3.21.11/ex3_21_11.sce b/2288/CH3/EX3.21.11/ex3_21_11.sce
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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");