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diff --git a/863/CH4/EX4.5/Ex4_5.txt b/863/CH4/EX4.5/Ex4_5.txt
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index 000000000..96dfa4dcf
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+++ b/863/CH4/EX4.5/Ex4_5.txt
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+//Caption:Calculate Rc and Rb
+//Ex4.5
+clc;
+clear;
+close;
+Vcc=12//Collector voltage(in volts)
+V=3//Input voltage(in volts)
+Ic=1//collector current(in mA)
+Vce=0.2//Saturated collector emitter voltage(in volts)
+hfe=70
+Vbe=0.7//Base emitter voltage(in volts)
+Rc=(Vcc-Vce)/Ic
+Ib=Ic*1000/hfe
+Rb=(V-Vbe)*1000/Ib
+disp(Rb,Rc,'Rc and Rb(in kilo ohm)=')
+\ No newline at end of file