December 2010, Section 4, LR, #18 "Sentient Beings"

secretad
Posts: 209
Joined: Tue Jan 04, 2011 11:26 pm

December 2010, Section 4, LR, #18 "Sentient Beings"

Postby secretad » Wed May 11, 2011 9:39 pm

I really struggle on sufficient assumption questions. I am scoring 170+ on my preptests, but I cringe when I see a sufficient assumption question. On a question like this one, I really leaned towards not diagramming it. I mean I gathered that it is essentially:

Premise: If SB on planets outside solar system --- > ~Determine

Premise: ~Spacecraft

Premise: SB on another planet capable of communicating in the near future ---> at least as intelligent as humans

Conlcusion:
Determine ---> SB at least as intelligent as humans


I also took notice of the varying phrases in the stimulus, going from planets outside our solar system, to later on saying another planet, regardless of whether or not it is in our solar system.

The correct answer is D.
Last edited by secretad on Sat May 28, 2011 10:12 pm, edited 1 time in total.

User avatar
510Chicken
Posts: 88
Joined: Sat Jan 15, 2011 5:50 pm

Re: December 2010, Section 4, LR, #18 "Sentient Beings"

Postby 510Chicken » Thu May 12, 2011 3:38 am

secretad wrote:D) If a sentient being on another planet cannot communicate with us, then the only way to detect its existence is by ending a spacecraft to its planet.

This can be written as:
D --> (C v S) (D = Detect/Determine; C = Communicate; S = Spacecraft)

Since ~S is given:
D --> C

C --> I (I = Intelligent) (Given)
So:
D --> C --> I
D --> I

Which, incidentally, is the conclusion you're looking for.
(or alternatively, ~I --> ~C --> ~D)

User avatar
lakers3peat
Posts: 493
Joined: Thu Sep 16, 2010 7:10 pm

Re: December 2010, Section 4, LR, #18 "Sentient Beings"

Postby lakers3peat » Sat May 28, 2011 7:29 pm

510Chicken wrote:D) If a sentient being on another planet cannot communicate with us, then the only way to detect its existence is by ending a spacecraft to its planet.

This can be written as:
D --> (C v S) (D = Detect/Determine; C = Communicate; S = Spacecraft)

Since ~S is given:
D --> C
)[/quote]


Is that really inferrable? Jeez I had so much trouble with this question; I thought I had my formal logic down but I guess I dont :?



Op: you might want to revise your post to remove the infringement, at least paraphrase




Return to “LSAT Prep and Discussion Forum”

Who is online

Users browsing this forum: 34iplaw, BobBoblaw, Greenteachurro, Instrumental and 10 guests