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diff --git a/1133/CH3/EX3.18/Example3_18.sce b/1133/CH3/EX3.18/Example3_18.sce
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+//Example 3.18.
+clc
+disp("Given: A_v mid = 40, f_L = 100 Hz, f_H = 15 kHz and beta = 0.01")
+avf=400/(1+(0.01*400))
+format(3)
+disp(avf,"  A_vf = A_v mid / 1+beta*A_v mid =")
+flf=100/(1+(0.01*400))
+disp(flf,"  f_Lf = f_L / 1+beta*A_v mid =")
+fhf=(15)*(1+(0.01*400))  // in kHz
+disp(fhf,"  f_Hf(in kHz) = f_H * (1+beta*A_v mid) =")
+bw=75-0.02  // in kHz
+format(6)
+disp(bw,"  BW_f(in kHz) = f_Hf - f_Lf =")