Question: Consider a capital budgeting formulation where the binary variables x 1 and x 2 are used to represent the acceptance ( x i = 1)

Consider a capital budgeting formulation where the binary variables x1 and x2 are used to represent the acceptance (x = 1) or rejection (xi= 0) of each alternative. The requirement that x2 is contingent upon x1 can be represented by which of the following?

a. x1 + x2 ≤ 1

b. x2 ≤ x1

c. x1 + x2 ≥ 1

d. x1 ≤ x2

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