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diff --git a/74/CH1/EX1.17/example17_sce.sce b/74/CH1/EX1.17/example17_sce.sce
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+//chapter1
+//example 1.17
+//page 49, figure 1.60
+I=.2*10^-3; B=200;Va=100;Rl=%inf;
+Vt=26*10^-3//assuming at room temprature
+I2=I/2
+I4=I2
+r02=Va/I2;
+disp(r02)
+r04=Va/I4;
+disp(r04)
+Gm=2/Vt
+Aid=Gm/((1/r02)+(1/r04)+(1/Rl));
+disp(Aid)
+Ri=2*(B/I)//Ri=2*r
+disp(Ri)
+Ri=(r02*r04)/(r02+r04);
+disp(Ri)
+\ No newline at end of file