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diff --git a/1694/CH6/EX6.20/Ex6_20.sce b/1694/CH6/EX6.20/Ex6_20.sce
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index 000000000..3130e5a66
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+++ b/1694/CH6/EX6.20/Ex6_20.sce
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+clear;
+clc;
+printf("\nEx-6.20\n");
+//page no.-192
+//given
+rho=1.7*10^-8;......//resistivity in ohm m
+M=63.54;...........//atomic weight
+d=8.96*10^3;......//density in Kg/m^3
+N=6.025*10^23;......//avagadro no.
+e=1.6*10^-19;.......//charge
+
+no=(N*d)/M........//no of electrons per unit volume
+
+printf("\nno. of electrons/ unit volume 8.50*10^28 /m^3\n");
+
+mu=(1)/(rho*e*no).......//mobility in m/Vs
+
+printf("\nmobility is 4.35*10^-3 m/Vs");