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diff --git a/226/CH5/EX5.17/example17_sce.sce b/226/CH5/EX5.17/example17_sce.sce
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+//chapter 5
+//example 5.17
+//page 220
+printf("\n")
+printf("given")
+hFE=100;
+Rc=2.2*10^3;Rb=270*10^3;Re=1*10^3;R1=33*10^3;R2=12*10^3;
+S=1+hFE
+disp("for collector to base bias")
+S=(1+hFE)/(1+(hFE*Rc)/(Rc+Rb))
+disp(" for voltage divider bias")
+disp("S=(1+hFE)/(1+hFE*Re(Re+R1||R2))")
+S=(1+hFE)/(1+(hFE*Re)/(Re+(R1*R2)/(R1+R2)))
+\ No newline at end of file