Refer to the figure. What is the constraint associated with node 1?
A) X21+ X31 - X12 - X13 = -1
B) X21 + X31 - X12 - X13 = +1
C) + X31- X12 - X13 = 0
D) X12 + X13 = 0
E) -X12 + X13 = -1
A
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