Question: Determine the answer using the instructions provided. Let X1, X2 and X3 be 01 variables whose values indicate whether projects 1,2 and 3 are done

Determine the answer using the instructions provided.

Let X1, X2 and X3 be 01 variables whose values indicate whether projects 1,2 and 3 are done respectively. In other words, for i=1,2,3,Xi=1 if project i is done and Xi=0 if the project is not done. Write a constraint that ensures that exactly TWO projects are done

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