PT #9 Section 4 Question 4

ebm3q
Posts: 13
Joined: Sat Oct 02, 2010 10:45 pm

PT #9 Section 4 Question 4

Postby ebm3q » Tue Mar 01, 2011 1:05 pm

I am having trouble understanding the answer to this problem. Perhaps it is the "only if" element that I do not understand.

Elec. is moral and intelligent -------> dem. function well

Must be true question. "logically inferred"

answer. ~Elec. moral and intell. -----> ~dem. function well

~ = negation.

Isn't this mistaken negation? I think maybe I am diagramming the prompt incorrectly. I would greatly appreciate any help. Thank you very much!

Cambridge LSAT
Posts: 270
Joined: Mon Aug 24, 2009 3:26 pm

Re: PT #9 Section 4 Question 4

Postby Cambridge LSAT » Tue Mar 01, 2011 2:17 pm

"Only if" signals the necessary condition, so the stimulus would be diagrammed like so:
DFW → ME and IE

The contrapositive (choice C) looks like so:
~ME or ~IE → ~DFW

DFW = democracy functions well
ME = moral electorate
IE = intelligent electorate

ebm3q
Posts: 13
Joined: Sat Oct 02, 2010 10:45 pm

Re: PT #9 Section 4 Question 4

Postby ebm3q » Wed Mar 02, 2011 1:34 pm

Thank you very much! I thought "only if" was my problem!




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