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diff --git a/2045/CH4/EX4.2/Ex4_2.sce b/2045/CH4/EX4.2/Ex4_2.sce
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+//pagenumber 202 example 2
+clear
+colvoltag=12;//volts
+vbe=5;//volts
+colcur=10*10^-3;//ampere
+vce=5;//volts
+beta1=50;
+ib=colcur/beta1;
+rb=(vbe-0.7)/ib;
+rc=(12-vbe)/colcur;
+//when 100ohm included
+disp("rb   =   "+string(rb)+"ohm");
+disp("rc   =   "+string(rc)+"ohm");
+rb=(vce-0.7-(colcur+ib)*beta1)/ib;
+
+disp("rb at emitter resistance 100ohm   =   "+string(rb)+"ohm");//correction in the book
+
+
+