Question: Let X1, X2, X3, and 4 be 0-1 variables whose values indicate whether the projects are not done (O) or are done (1). Which of

Let X1, X2, X3, and 4 be 0-1 variables whose values indicate whether the projects are not done (O) or are done (1). Which of the following answers indicates at least 1 or 3 is selected, or both project 1 and 3 can be selected? a) xy + x3 $ 1 Ob) xq 2 X3 Oc) X2 + x3 2 1 d) x1 + x3 = 1

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