Hi @bdeleon, thanks for your post. As explained in the in-app answer explanation for the correct answer choice (C), the either/or formulation is correctly diagrammed following these rules:
"Either X or Y" means at least one of X or Y must exist. Step 1: pick a variable (whether X or Y; doesn't matter which), and place it in the necessary position. Step 2: negate the other variable (Y or X) and place it in the sufficient position.
All right. So: Either "write something worth reading" = WSWR Or "do something worth writing" = DSWW
If you make DSWW the necessary condition, and negate WSWR, the correct diagram is: not WSWR ==> DSWW
This is answer choice (C).
Answer choice (B) is an incorrect reversal of the correct diagram as set out in answer choice (C).
Hope this helps!
mamieOctober 5, 2019
Wouldn't B work? If you decided to make the sufficient condition DSWW, you'd get DSWW => not WSWR with the contrapositive WSWR => not DSWW. I am confused about a, b and c
juliekattNovember 23, 2021
I was wondering the same thing as this last question. If I make the DSWW the sufficient condition I'd get DSWW=>not WSWR with the contrapositive WSWR=>not DSWW so there is more than one right answer.
RaviFebruary 5, 2022
@mamie and @juliekatt, B doesn't work because the statement is an either/or statement, meaning at least one thing has to be done no matter what (this allows for the possibility of both things being done). The LSAT uses an inclusive "or," which means that when you see "or," you need to think it means one, or both.
B doesn't work because it's effectively saying that if you do one of the things, you cannot do the other. This is how you diagram a "not both" statement. As noted, unless told otherwise, always assume that "or" statements are inclusive on the LSAT.
