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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS
+//Example 9
+
+disp("CHAPTER 1");
+disp("EXAMPLE 9");
+
+//VARIABLE INITIALIZATION
+r1=1; //in Ohms
+r2=2; //in Ohms
+r3=3; //in Ohms
+r4=1; //in Ohms
+
+//SOLUTION
+
+//delta values
+rab=r1; //between points a and b
+rac=r2; //between points a and c
+rbc=r3; //between points b and c
+//coverting delta abc into star
+//star values
+r=rab+rbc+rac;
+ra=(rab*rac)/r;
+rb=(rab*rbc)/r;
+rc=(rbc*rac)/r;
+
+req1=r1+r4;
+req2=rb+r2;
+req3=(req1*req2)/(req1+req2);
+req4=ra+req3;
+disp(sprintf("The equivalent input resistance is %f Ω",req4));
+
+//END
+