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Posted: Sat Nov 16, 2013 9:38 pm
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I agree with you, I'm not a 180 lsater tho.BerkeleyMan5 wrote:Hey all,
I'm usually pretty good on formal logic and I generally only stick to the Powerscore (some and most) train methods when it comes to dealing with this kind of stuff.
I'm going through MLSAT LR right now and just looking over their formal logic section.
On one of the drill problems, it says:
"Nearly all of Jason's books are fiction books, and all of Jason's Book are written in Spanish."
I would diagram this like so:
JB--M--> F
JB-----> S
then I would combine these statements to get this.
F<--M--JB---->S
I would then reverse the most statement into a some statement and come to the conclusion that :
F<--S-->S
Some of Jason's books are fiction books written in Spanish (and vice versa).
However, the MLSAT book is claiming that "Most of Jason's books are fiction books written in Spanish" is a valid inference.
Intuitively this statement makes sense, but using the some and most train I don't see how you can safely get to this inference.
Is this a typo or is there some drastic error in my formal logic thought process? If any of you have the book this is on page 375, question 7.
Diagrams are a useful tool, but you shouldn't be mechanical about them. You should always think about the things the diagrams represent. Let's say Jason has 100 books. All of them are in spanish. Nearly all of his books are fiction. Let's say nearly all is 95.BerkeleyMan5 wrote:Hey all,
I'm usually pretty good on formal logic and I generally only stick to the Powerscore (some and most) train methods when it comes to dealing with this kind of stuff.
I'm going through MLSAT LR right now and just looking over their formal logic section.
On one of the drill problems, it says:
"Nearly all of Jason's books are fiction books, and all of Jason's Book are written in Spanish."
I would diagram this like so:
JB--M--> F
JB-----> S
then I would combine these statements to get this.
F<--M--JB---->S
I would then reverse the most statement into a some statement and come to the conclusion that :
F<--S-->S
Some of Jason's books are fiction books written in Spanish (and vice versa).
However, the MLSAT book is claiming that "Most of Jason's books are fiction books written in Spanish" is a valid inference.
Intuitively this statement makes sense, but using the some and most train I don't see how you can safely get to this inference.
Is this a typo or is there some drastic error in my formal logic thought process? If any of you have the book this is on page 375, question 7.