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+// Exa 1.5
+format('v',7);
+clc;
+clear;
+close;
+// Given data
+Rf= 1;// in Mohm
+Rf=Rf*10^6;//in ohm
+
+// Part(a)
+V1=1;//in volt
+V2=2;//in volt
+V3=3;//in volt
+R1= 500;// in kohm
+R1=R1*10^3;//in ohm
+R2= 1;// in Mohm
+R2=R2*10^6;//in ohm
+R3= 1;// in Mohm
+R3=R3*10^6;//in ohm
+Vo= -Rf*(V1/R1+V2/R2+V3/R3);// in volt
+disp(Vo,"(a) Output voltage in volt is : ")
+
+// Part(b)
+V1=-2;//in volt
+V2=3;//in volt
+V3=1;//in volt
+R1= 200;// in kohm
+R1=R1*10^3;//in ohm
+R2= 500;// in kohm
+R2=R2*10^3;//in ohm
+R3= 1;// in Mohm
+R3=R3*10^6;//in ohm
+Vo= -Rf*(V1/R1+V2/R2+V3/R3);// in volt
+disp(Vo,"(b) Output voltage in volt is : ")