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diff --git a/2045/CH4/EX4.17/Ex4_17.sce b/2045/CH4/EX4.17/Ex4_17.sce
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+//example 17
+clear
+beta1=25;
+colres=2.5*10^3;//ohm
+vcc=10;//volt
+vce=-5;//volt
+ic=-(vcc+vce)/colres;
+ib=ic/beta1;
+rb=vce/ib;
+stability=(1+beta1)/((1+beta1)*((colres)/(colres+rb)));
+disp("base resistance   =   "+string((rb))+"ohm");//correction in book
+disp("stability   =   "+string((stability)));
+
+
+