"Which of the following, if substituted for the constraint"

GoTribe21

Help! I always get these wrong and they seem so simple. I don't understand what I'm missing. Any advice?

ClaudioD21

These questions seem easy but are actually not. These questions are usually the most difficult ones out of any given LG due to how subtle they are in appearing as easy but actually aren’t. They are, by design, time sink questions meant to waste your time and unless you consistently go -0 or close to that on LG I’d say guess and skip it. These questions often sneak in new constraints or subtly remove other constraints which is what makes them so hard. There’s some videos on this topic in the CC that do a great job at explaining it and I would highly recommend them.

https://7sage.com/lesson/substitution-and-equivalence-theory/