74 LR Two Question 19
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Just want to confirm that you went through the 3 step process (or should have):
step 1: List conditions (Order doesn't Matter)
Sell Out (S)
Not Promoted (P')
Step 2: Draw Arrows
Step 3: Flip and negate
P -> S
S' -> P'
I had to go back and watch this video https://www.velocitylsat.com/video/unlesswithout-statements to understand how I would get those conditionals. I am not sure how you got them, sine you didn't show your work :)
That's exactly how I recommend you get the most out of the course! The Theory videos lay out the rules that we then follow when answering questions. For conditional statements, those rules are mathematical and unchanging, so you can be sure you will be correct to apply them the same way every time.
You have the passage mis-symbolized.
See this video for a rule you can always apply to symbolize this formulation correctly.
Highly skill surgeon -> Survive
No survival --> Not properly performed
is it wrong because the conclussion talks about being properly performed instead of not being performed by a high skilled surgeon?
Ah, but notice that in (A) the surgeon only says the patient will probably survive. She doesn't offer a truly conditional opinion.
In our argument, the concert expert says it's certain to sell out unless it's not promoted. This expert does offer a truly conditional opinion.
ETA: Oh! Yes, you are also correct! That's another valid reason to eliminate (A). Notice that your (correct and good) reason is semantic where mine was structural. Keep paying close attention to the structure of these arguments; it's often a faster/easier way out of a jam.
"Semantic" content in an argument refers to the words used and their meaning. For example, the difference between "properly performed" and "performed by a surgeon."
"Structural" references relate instead to the logical function of the argument. For example, the difference between a conditional claim and a non-conditional claim.