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diff --git a/1223/CH3/EX3.1/Ex3_1.sce b/1223/CH3/EX3.1/Ex3_1.sce
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+clear;
+clc;
+//Example 3.1
+//let beta be "b"
+b=150;//common emitter current gain
+iB=15*10^-3;//(mA) base current
+//assume transistor biased in forward active mode
+iC=b*iB;
+printf('\ncollector current=%.2f mA\n',iC)
+iE=(1+b)*iB;
+printf('\nemitter current=%.2f mA\n',iE)
+a=b/(1+b);
+printf('\ncommon base current gain=%.3f\n',a)