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diff --git a/2609/CH2/EX2.7/ex_2_7.sce b/2609/CH2/EX2.7/ex_2_7.sce
new file mode 100755
index 000000000..a286f9be7
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+////Ex 2.7
+clc;
+clear;
+close;
+format('v',7);
+Beta=100;//unitless
+VBE=0.7;//V
+VD1=0.7;VD2=0.7//V
+VCC=15;//V
+VEE=15;//V
+VT=26;//mV
+RE=560;//ohm
+RC=6.8;//kohm
+R=220;//ohm
+VB=-VEE+VD1+VD2;//V
+VE=VB-VBE;//V
+IE3=(VE-(-VEE))/RE*1000;//mA
+IT=IE3;//mA
+ICQ=IT/2;//mA
+VCEQ=VCC+VBE-ICQ*RC;//V
+Q=[ICQ VCEQ];//[mA V](Q point)
+disp(Q,"Q point (ICQ(mA), VCEQ(V)) is ");
+re=2*VT/IT;//ohm
+Ad=-RC*1000/re;//unitless
+disp(Ad,"Differntial moe gain, Ad");
+//Answer in the book is wrong for Q point.