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diff --git a/1694/CH1/EX1.20/EX1_20.sce b/1694/CH1/EX1.20/EX1_20.sce
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+clear;
+clc;
+printf("\nEx1.20\n");
+//page no.-33
+//given
+a=2.9*10^-10;......//lattice constant in m
+M=55.85;........//atomic wt. of Ge
+N=6.02*10^26;....//avagadro no.
+rho=7870;........//density in Kg/m^3
+
+n=(a^3*rho*N)/M........//no. of atoms per unit cell
+
+printf("\nNo. of atoms per unit cell is 2 \n");