Question: Given the following Branch - and - Bound tree, where nodes are labeled N 1 , . . . , N 9 and the numbers

Given the following Branch-and-Bound tree, where nodes are labeled N1,..., N9 and the numbers below each node indicate the value of its LP relaxation. The incumbent solution was obtained in solving the LP at N4. The optimal LP solution was feasible for the IP and had objective value 25.

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