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diff --git a/1217/CH4/EX4.8/Exa4_8.sce b/1217/CH4/EX4.8/Exa4_8.sce
new file mode 100755
index 000000000..6405e3f65
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+++ b/1217/CH4/EX4.8/Exa4_8.sce
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+//Exa 4.9
+clc;
+clear;
+close;
+// given data
+R1=10;//in Kohm
+R4=8;//in Kohm
+R5=3;//in Kohm
+RF=45;//in Kohm
+AD=(1+2*R4/R5)*(RF/R1);
+disp(AD,"Gain for the instrumention amplifier is : ")
+\ No newline at end of file