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Consider the LP for finding the shortest - route path from node 1 to node 7 . Bidirectional arrows ( ) indicate that travel is

Consider the LP for finding the shortest-route path from node 1 to node 7. Bidirectional arrows () indicate that travel is possible both ways. Let Xij =1 if the route from node i to node j is taken and 0 otherwise.
Which of the following represents the constraint for Node 4?
Group of answer choices
-X12-X42-X52+X21+X24+X25=1
-X12-X42-X52+X24+X25=1
-X12-X42-X52+X21+X24+X25=0
None of other choices
-X12-X42-X52+X24+X25=0

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