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PT4, Section 1 LR #24 has me a bit baffled. I answered B, but E is correct. If my mapping of E is correct, then I get why it is the right answer. It is then B that I am focused upon.

Questions:

1. Did I diagram the conclusion of B backward? If so then it would be mistaken negation like the stim.

2. Is E diagramed correctly?

Using Powerscore like diagramming, here's what I thought:

The Stim: mistaken negation
p: encourage freedom -> creativity flourished
c: creativity flourished -> encourage freedom

Answer B, which is the correct diagramming?

THIS?

p: increase efficiency -> crime down
c: increase efficiency -> crime down

OR THIS?

p: increase efficiency -> crime down
c: crime down -> increase efficiency

Answer E: Is this correctly diagrammed? If so, then I see that it is mistaken negation which differs from the mistaken reversals of the other answers.
p: ~western democracies democratic -> opinion meaningful
c: western democracies democratic-> ~opinion meaningful

Thanks for the help!

Any takers?

I think I might look at this one a bit differently.

The stimulus gives us an argument that commits a reversal = "mistaken reversal" in Powerscore language.

EFT ---> CF
CF
========
EFT

The question stem asks us to find the one answer choice that does not also commit a reversal.

(A) commits a reversal (Key: S = safe, R = airfares rise)
S ---> R
R
======
S

(B) commits a reversal (Key: IE = improved efficiency, CD = crime down)
IE ---> CD
CD
=======
IE

(C) commits a reversal (Key: IPW = interested in preserving wildlife, H = hunting)
IPW ---> ~H
~H
========
IPW

(D) commits a reversal (Key: S = safe, P = poison)
S ---> ~P
~P
======
S

(E) is a valid argument. It's a contrapositive! (Key: D = democratic, ME = meaningful effect)
D ---> ME
~ME
=======
~D


Does that help you with your question? I think you might have been misreading the flaw.

PERFECT! You've cleared mea up. Thanks much.

BTW, I recently got your company's LG book: it is quite awesome. The sequencing and combination sections are lifesavers.

matt@atlaslsat wrote:I think I might look at this one a bit differently.

The stimulus gives us an argument that commits a reversal = "mistaken reversal" in Powerscore language.

EFT ---> CF
CF
========
EFT

The question stem asks us to find the one answer choice that does not also commit a reversal.

(A) commits a reversal (Key: S = safe, R = airfares rise)
S ---> R
R
======
S

(B) commits a reversal (Key: IE = improved efficiency, CD = crime down)
IE ---> CD
CD
=======
IE

(C) commits a reversal (Key: IPW = interested in preserving wildlife, H = hunting)
IPW ---> ~H
~H
========
IPW

(D) commits a reversal (Key: S = safe, P = poison)
S ---> ~P
~P
======
S

(E) is a valid argument. It's a contrapositive! (Key: D = democratic, ME = meaningful effect)
D ---> ME
~ME
=======
~D


Does that help you with your question? I think you might have been misreading the flaw.