If a company selects Project 1 then it must also select either Project 2 or Project 3. Which of the following constraints enforces this condition?
a. X1 ? X2 ? X3 ? 0
b. X1 + (X2 ? X3) ? 0
c. X1 + X2 + X3 ? 2
d. X1 ? X2 ? X3 ? 0
Expert Answer
Correct option is: b. X1 + (X2 ? X3) ? 0
If a company selects project 1 (X1) it must also select Project 2 (X2) or Project 3 (X3)
This condition is enforces by – X1 + (X2 ? X3) ? 0