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


d

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Business