Question: In a 0-1 linear integer program, 1 corresponds to a yes decision and 0 to a no decision. If there are 4 projects under consideration

In a 0-1 linear integer program, 1 corresponds to a yes decision and 0 to a no decision. If there are 4 projects under consideration (A, B, C, and D) and at most 2 can be chosen, then the following constraint needs to be added to the formulation: A + B + C + D 2 A + B + C + D 4 A + B + C + D = 2 A + B + C + D 1

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