Let X1 and X2 Be 0-1 Variables Whose Values Indicate

question 34

Multiple Choice

Let x1 and x2 be 0-1 variables whose values indicate whether projects 1 and 2 are/are not done.Which of the following answers indicates that project 2 can be done only if project 1 is done?

• A)x₁ + x₂ = 1
• B)x₁ + x₂ = 2
• C)x₁ − x₂ ≤ 0
• D)x₁ − x₂ ≥ 0

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