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diff --git a/2183/CH8/EX8.20/Ex_8_20.sce b/2183/CH8/EX8.20/Ex_8_20.sce
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+// Example 8.20;//maximum length of the system
+clc;
+clear;
+close;
+af=0.20;//dB/km
+ac1=0.05;//dB/km
+k=4;//
+b=1.2;//G bit/s
+c=3*10^8;//m/s
+h=1.55;//micro meter
+sndb=17
+sn=10^(sndb/10);//
+l=100;//km
+hc=6.63*10^-34;//
+lt=((10^-3*h*10^-6*(10^-((af+ac1)*(l/10)))*l*10^3)/(k*hc*c*b*10^12*sn));//
+disp(lt,"maximum length of the system in km is")
+//answer is wrong in the textbook