Question: Let XA and XB be decision variables corresponding to taking up project A and project B (eg: XA =0 if don't take up A and
Let XA and XB be decision variables corresponding to taking up project A and project B (eg: XA =0 if don't take up A and XA = 1 if take up A).
Question: How to model (write out an inequality or equation that conveys the logic below):
1. Can undertake project A or B but not both
2. Can undertake A only if B is also done
3. Can undertake A and B only if done together
4. Have to undertake A if B is taken up for investment
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