Quantitative Methods

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Consider a capital budgeting example with 5 projects from which to select. Let x1 = 1 if project a is selected, 0 if not, for a = 1, 2, 3, 4, 5. Conditions are independent. Projects cost $100, $200, $150, $75, and $300 respectively. The budget is $450. Write the appropriate constraint for the following condition. If project 3 is chosen, project 4 must be chosen.
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Hello!
This constraint may be written as:

x3 = x4

Or equivalently,

x3 – x4 = 0

So if …