Question: 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.