I am starting my LSAT prep and was watching your old playlist, so happy to see that there is an updated version since I will be taking the version post-August-2023! Thank you for thinking of us youtube learners :D
This was so good. I really love how you simplified the explanation of the complex language. Simple, but did wonders for me moving forward. This lesson as whole also increased my confidence for drill sets and practice tests. Even though theres still room for improvement. I feel like I know what I am doing which is half the battle. lol
Great content!: 28:38 has error where the left column should have the header as conclusion signals. Maybe even a third column should be included where they overlap ;). Thank you for the videos!
Great video. Thank you. I think there is a mistake in Practice Set #1. Only those who have registered can attend. The if-then statement should be: "If X is registered, then X can attend."
Only X can Y means X is necessary for Y. However, it does not mean X is sufficient for Y. For instance, only those who are on Earth are in the US. That does not mean anyone on Earth is in the US. It means ~Earth --> ~US (those who are not on Earth are not in the US) and US --> Earth (those who are in the US are on Earth). The word "only" is very important. It can make a sufficient condition into a necessary condition. Only if is similar in that whereas if implies a sufficient condition (trigger), only if implies a necessary condition (the condition that must be true if the trigger is true).
Thank you for this training tool. When will you have the Insight LSAT website up? I am looking forward to integrating these videos and the website together.
Thanks a lot for this series. In your old series you assigned problem sets from the "next 10 official, actual LSAT preptests" book. Wonder if those are still relevant / will you assign from that book again, or due to the exam content and structure change they are no longer an accurate representation of the exam?
I am trying to understand the use of "only" and "only if" in logical statements. Specifically, I am confused about why the contrapositive of the original statement is treated as the equivalent original statement and vice versa. In logical terms, "only" introduces a necessary condition. This means that the part following "only" is required for the statement to be true. For example, take the statement: "Only those who have registered can attend." The word "only" introduces a necessary condition. Therefore, it should be written as A→R (If someone can attend, then they must have registered) and the contrapositive would be ¬R→¬A (If someone has not registered, then they cannot attend). Additionally, I want to confirm that the rules are the same for "only if." "Only if" also introduces a necessary condition, similar to "only". For instance, in the statement: "We can go on vacation only if we save money." The phrase "only if" introduces a necessary condition. Thus, it should be symbolized as V→S (If we can go on vacation, then we must have saved money) and the contrapositive would be ¬S→¬V (If we have not saved money, then we cannot go on vacation). I was taught that the part after "only" or "only if" is always the necessary condition and not the trigger or sufficient condition. The contrapositive will then follow logically by negating and reversing the original statement. Where are the discrepancies coming from?
You are assuming that if they didn't attend then they didn't register. or They could have not registered and still attended. If and only if they register they can attend fits your contrapositive ¬R→¬A
Yeah they removed them from the LSAT so moving forward it's just logical reasoning and reading comprehension and then the writing piece that you get either before you take the LSAT or after.
