If x1 and x2 are 0-1 variables whose values indicate which
If x1 and x2 are 0-1 variables whose values indicate which of two fixed costs are included in a total cost, which constraint indicates that both fixed costs are included?
a. x1 + x2 = 2
b. x1 - x2 = 0
c. x1 + x2 > 0
d. x1 + x2 <= 1
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