Question: Suppose x1, x2, and x3 are binary variables that are equal to 1 if the corresponding project (1, 2, or 3) is selected and 0

Suppose x1, x2, and x3 are binary variables that are equal to 1 if the corresponding project (1, 2, or 3) is selected and 0 if the corresponding project is not selected. Which constraint reflects the statement "if project 1 is selected then project 2 must be selected"?

x1 + x2 2

x1 x2

x1 + x2 2

x1 x2

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