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+//Example number 1.2, Page number 10
+
+clc;clear;
+close;
+
+//Variable declaration
+e=1.6*10**-19;      //charge(coulomb)
+epsilon0=8.85*10**-12;   
+r0=0.41*10**-3;    //equilibrium distance(m)
+A=1.76;      //madelung constant
+n=0.5;       //repulsive exponent value
+
+//Calculation
+Beta=72*%pi*epsilon0*r0**4/(A*e**2*(n-1));    //compressibility
+
+//Result
+printf( "compressibility =  %.4e",Beta)
+//answer in the book is wrong