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+// Exa 2.5
+
+clc;
+clear;
+
+// Given
+
+// A Hartley oscillator under consideration
+L1 = 100*10^-3; // Inductance(H)
+L2 = 1*10^-3; // Inductance(H)
+M = 50*10^-3; // Inductance(H)
+C = 100*10^-12; // Capacitor(F)
+
+// Solution
+
+L = L1+L2+2*M;
+printf(' By calculation, L = %d H \n',L*10^3);
+
+f = 1/(2*%pi*sqrt(L*C));
+
+printf('  The frequency of oscillation = %d kHz \n',f*10^-3);
+
+// The answer provided in the textbook is wrong