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14.1 Consider the following network flow problem: 12 10 -9 17 1 Numbers shown above the nodes are supplies (negative values represent demands) and numbers

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14.1 Consider the following network flow problem: 12 10 -9 17 1 Numbers shown above the nodes are supplies (negative values represent demands) and numbers shown above the ares are unit shipping costs. The darkened arcs form a spanning tree (a) Compute primal flows for each tree arc. (b) Compute dual variables for each node. (c) Compute dual slacks for each nontree arc

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