Let X₁,x₂,and X₃ Be 0-1 Variables Whose Values Indicate Whether

question 2

Multiple Choice

Let x₁,x₂,and x₃ be 0-1 variables whose values indicate whether the projects are not done (0) or are done (1) .Which of the following answers indicates that at least two of the projects must be done?

• A)x₁ + x₂ + x₃ ≥ 2
• B)x₁ + x₂ + x₃ ≤ 2
• C)x₁ + x₂ + x₃ = 2
• D)x₁ − x₂ = 0

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