PrepTest 49, Section 4, LR 24

s1m4
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PrepTest 49, Section 4, LR 24

Postby s1m4 » Fri Jan 22, 2010 4:32 pm

#24

Can somebody please explain why A is correct, and how other choices could be eliminated? (B is easy to eliminate, but the others not so much.)

Very tough parallel flaw question..

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

Re: PrepTest 49, Section 4, LR 24

Postby Cambridge LSAT » Fri Jan 22, 2010 5:16 pm

A simple example with numbers will help to illustrate the flaw:
# of employees: 100
# of employee computer programmers: 51
# of computer programmers (total): 20,000
# of computer programmers with excellent salaries: 10,001
# of computer programmers without excellent salaries: 9,999

All the computer programmers at this company could belong to the set of computer programmers who don't have excellent salaries.

Similarly in choice A, none of the numbers are given, so there is no way to know for certain that the two sets overlap.
# of Molly's classmates: 25
# of Molly's classmates who are gardeners: 13
# of gardeners (total): 20,000
# of gardeners with a great deal of patience: 10,001
# of gardeners without a great deal of patience: 9,999

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chewdak
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Joined: Fri Apr 03, 2009 5:54 pm

Re: PrepTest 49, Section 4, LR 24

Postby chewdak » Fri Jan 22, 2010 5:33 pm

Another "most" question.
We know "most" just means "majority" or over 50%.
The stimulus simplified reads:
Most A are B.
Most B have C.
Therefore at least one A has C.
This is faulty as explained above by cambridgelsat.
(A) parallels the structure above
(B) changes structure by using "some" instead of "at least one"
(C) changes conclusion so that it becomes 'Therefore at least one A, who is B, has C'.
(D) Changes premise from 'Most A are B' to "Most B in A are D"
(E) This one is actually true, not what we are looking for.
Last edited by chewdak on Fri Jan 22, 2010 5:50 pm, edited 1 time in total.

s1m4
Posts: 202
Joined: Tue Jan 12, 2010 10:04 pm

Re: PrepTest 49, Section 4, LR 24

Postby s1m4 » Fri Jan 22, 2010 5:39 pm

thx guys !!




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