Q12

[socatkn1p]

question 12- must be false answer

i do agree that D must be false, but i also feel C must be false. if X and W have exactly two conditions in common, then X has PL, since W has PL was a given rule, and W can not have S because W and Y have no options in common, leaving Y with only S. if all other original conditions stay the same, then V has PS. V can not add L, because Z has L and Z must have either P or S but not both. This fulfills having one common option with V, and having more options than T.

Please explain how C can be true.

[noah]

Please explain how C can be true.

Almost perfect write-up of the new board. However, you didn't finish discussing X. Could it have all 3 options?

[socatkn1p]

ah, i see that the diagram can remain the same despite the new condition; it was late and i was fatigued after 8 sections without a break. i must have took it as X and W have the same two options. my mistake, thanks for taking a look.

[noah]

ah, i see that the diagram can remain the same despite the new condition; it was late and i was fatigued after 8 sections without a break. i must have took it as X and W have the same two options. my mistake, thanks for taking a look.

It's not that the diagram stays the same - it's that X has the possibility of a third element (S), instead of the requirement.

Glad you figured it out. Get some sleep!

[tzyc]

For a question like this...
I thought we need to re-write the diagram from the beginning seeing the other 5 constraints (because the other constraints may have some effects on slots when one constraint is replaced...), but it seems we can just change the 2 slots and leave the others stay the same?

[noah]

For a question like this...
I thought we need to re-write the diagram from the beginning seeing the other 5 constraints (because the other constraints may have some effects on slots when one constraint is replaced...), but it seems we can just change the 2 slots and leave the others stay the same?

Good question. You should practice both strategies. Redrawing is safer if you go slowly, but clearly will take a lot of time. If you have a strong grasp of the game and how the diagram came together, then reverse engineering (thinking about the effects of the original rule) will be faster.

Generally, the new rule isn't going to affect every single part of the diagram--that's just not fair--but it's hard to say how much the new rule will affect and how hard the reverse engineering will be to do in your head.

If you're struggling with time on the section, this is exactly the sort of question to skip to give the time to the two easier questions you could nail in the same amount of time.