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Integer Programming is an extension of Linear Programming where the following is restricted to integer values?

If a subset of decision variables in integer programming models is restricted to integer values, what is this type of models?

Rounding the solution of an LP Relaxation to the nearest integer values provides

In the supply chain design problem, which of the following statements about the new plants is true?

What are the following interrelations between projects that can be modelled using 0-1 binary variables?