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diff --git a/2183/CH8/EX8.15/Ex_8_15.sce b/2183/CH8/EX8.15/Ex_8_15.sce
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+//Example 8.15 // 
+clc;
+clear;
+close;
+//given data :
+B=5*10^6;// in Hz
+Ts=10;// in ns
+Td=4;// in ns
+a=9;// in ns/km
+b=2;// in ns/km
+l=6;// in km
+Tn=a*l;// in ns
+Tc=b*l;// in ns
+Ts_max=(0.35/B)*10^9;
+disp(Ts_max,"T system_maxmum,(ns) = ")
+Tsys=1.1*sqrt(Ts^2+Tn^2+Tc^2+Td^2);
+disp(Tsys,"T system,(ns) = ")
+//answer is wrong in the textbook