Consider the following linear programming model: Max           2X1 + 3X2 Subject to:                   X1 ≤ 2                   X2 ≤ 3                   X1 ≤ 1                   X1, X2 ≥ 0 This linear programming model has:     a. alternate optimal solutions     b. infeasible solution   c. redundant constraint     d. unbounded solution

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Duality

Duality is a linear programming (LP) concept which states that it is possible to interpret every LP problem using two distinct methods, but they will have similar solutions. That means any LP problem can be mentioned in another equivalent form based on identical data.