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diff --git a/1691/CH1/EX1.31/Example1_31.sce b/1691/CH1/EX1.31/Example1_31.sce
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+++ b/1691/CH1/EX1.31/Example1_31.sce
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+//Example 1.31
+disp("For beta = -0.01,  D = 1+beta*A_v = 11")
+avf=-100/11
+format(5)
+disp(avf,"(i) Voltage gain  A_vf = A_v/D =")
+rif=10*11
+disp(rif,"(ii) Input impedance  R_if(in k-ohm) = R_i*D =")
+rof=20/11
+disp(rof,"(iii) Output impedance  R_of(in k-ohm) = Ro/D =")
+disp("For beta = -0.01,  D = 1+beta*A_v = 51")
+avf=-100/51
+disp(avf,"(i) Voltage gain  A_vf = A_v/D =")
+rif=10*51
+disp(rif,"(ii) Input impedance  R_if(in k-ohm) = R_i*D =")
+rof=20/51
+format(6)
+disp(rof,"(iii) Output impedance  R_of(in k-ohm) = Ro/D =")