Let X₁ , X₂ , and X₃ Be 0-1 Variables $\ge$

question 15

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 answer below indicates that at least two of the projects must be done?

• A)x₁ + x₂ + x₃ \(\ge\) 2
• B)x₁ + x₂ + x₃ \(\le\) 2
• C)x₁ + x₂ + x₃ = 2
• D)x₁ -x₂ = 0