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diff --git a/3020/CH17/EX17.7/ex17_7.sce b/3020/CH17/EX17.7/ex17_7.sce
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+clc;
+clear all;
+m=9.1e-31; // Mass of electron in Kg
+e=1.6e-19; // Charge of electron
+h=6.63e-34;//planck constant
+Ef=3;//fermi energy in eV
+Ed=0.01;//energy interval in eV
+E1=Ef*e;//At ground state
+E2=E1+(Ed*e);
+x=(2*((E2^(3/2))-(E1^(3/2))))/3;//temporary variable
+n=(4*%pi*x*((2*m)^(3/2)))/(h^3);//no of states between the energy level
+disp('',n,'no of states between the energy level is:')
+// Asbolutely wrong answer in book... Checked in calculator