Question: Let x1, x2, and x3 be 0-1 variables whose values indicate whether the projects are not done (0) or are done (1). Write a constraint

Let x1, x2, and x3 be 0-1 variables whose values indicate whether the projects are not done (0) or are done (1). Write a constraint modeling a situation in which

At least two of the projects must be done? (2 pts)

Project 2 can be done only if project 1 is done? (2 pts)

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