When the graph of a network has six branches with three tree branches then the minimum number of

When the graph of a network has six branches with three tree branches then the minimum number of equations required for the solution of the network is 

 (A) 2 (B) 3 (C) 4 (D) 5
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Answer :

When the graph of a network has six branches with three tree branches then the minimum number of equations required for the solution of the network is 3 

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