Multiple Choice
Let x1 and x2 be 0 - 1 variables whose values indicate whether projects 1 and 2 are not done or are done. Which answer below 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
Correct Answer:

Verified
Correct Answer:
Verified
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