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diff --git a/287/CH17/EX17.2/Exa17_2.sci b/287/CH17/EX17.2/Exa17_2.sci
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+//Determine the no. of circuits for en bloc signaling and overlap signaling
+
+S = 0.7;
+Hs = 150;
+U = 1-S;
+Hu = 20;
+
+SC = 0.8;
+
+Ns = 11;
+Nu = 4;
+
+D = S*Hs + U*Hu ;
+BHCA = (3600*SC)/D; //Using value from table - 3600
+N = Ns*S + Nu*U ;
+M1 = ( (95/2)*S + (63/2)*U );    //From Table given
+M2 = ( (114/2)*S + (63/2)*U );
+N1 = (8000*3600*0.2)/(M1*BHCA);
+N2 = (8000*3600*0.2)/(M2*BHCA);
+
+disp(D, 'Mean duration of a call (in s)')
+disp(BHCA, 'No. of Busy Hour Call Attempts (BHCA) per circuit')
+disp(N+0.1, 'Mean no. of digits dialed per call (apprx.)')
+disp(N1, 'No. of circuits serviced by En Bloc Signalling');
+disp(N2, 'No. of circuits serviced by Overlap Signalling');
+\ No newline at end of file