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diff --git a/2720/CH2/EX2.24.4/ex2_24_4.sce b/2720/CH2/EX2.24.4/ex2_24_4.sce
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+//Exa 2.24.4
+clc;
+clear;
+close;
+// Given data 
+N_V = 1.04 * 10^19;// in cm^-3
+T1 = 300;// in K
+T2 = 400;// in K
+del_E = 0.27;// in eV
+N_V = N_V * (T2/T1)^1.5;// in cm^-3
+KT = (0.0259) * (T2/T1);// in eV
+P_o = N_V * exp(-(del_E)/KT);// in cm^-3
+disp(P_o,"The thermal equilibrium hole concentration in silicon in cm^-3 is ");
+