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Author Topic: Preptest 31, Sect I, LG #2, 4  (Read 1483 times)

Pepperdine2010

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Preptest 31, Sect I, LG #2, 4
« on: February 02, 2010, 03:42:44 PM »
LG #2, Does anyone have insight regarding the inferences for this game?

LG #4, Would anyone mind setting up a diagram for this game, please?

Thank you.  :-[

Cambridge LSAT

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Re: Preptest 31, Sect I, LG #2, 4
« Reply #1 on: February 02, 2010, 05:05:08 PM »
For game #2, first get a handle on the conditions:
#1: PU; ~ON
#2: PN and PU --> SN and SU; ~SN or ~SU --> ~PN or ~PU (contrapositive)
#3: JN and JU --> ~RN and ~RU; RN or RU --> ~JN or ~JU (contrapositive)
#4: ~JN and ~JU --> PN; ~PN --> JN or JU (contrapositive)
#5: RN or RU --> ~SN and ~SU; SN or SU --> ~RN and ~RU (contrapositive)

A couple of the conditions can be simplified:
JN and JU <--|--> R (#3)
R <--|--> S (#5)

Combining the first two conditions, we know that if PN is on sale, then SN and SU are on sale. We can also link the fourth condition into the equation:
~JN and ~JU --> PN --> SN and SU

Here are explanations for a couple of the questions:
10. Starting with the first condition given in choice D, due to the fourth rule, new pop must be on sale. Since both types of pop are on sale, both types of soul must be on sale (second rule), which contradicts the second condition given in answer choice D.

11. From the fourth rule, we know that new pop is on sale. Since used pop is on sale (first rule), the second rule is triggered, and both types of soul must be on sale. Since rap and soul cannot both be on sale (fifth rule), we know that rap is not on sale. Thus, we can eliminate B, C, D, and E, and A is left as the correct answer. We cannot infer anything about used opera.

Here's a diagram for the fourth game:
PrepTest 31, Game 4

Pepperdine2010

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Re: Preptest 31, Sect I, LG #2, 4
« Reply #2 on: February 02, 2010, 08:38:40 PM »
I was hoping you would reply :). Thank you very much (again) for the help. I appreciate it immensely.