Hello, I don't understand option B for this question

Started by Slade · started 2020-08-20 01:24 · last activity 2020-08-21 01:43 · 2 replies

Can I get a better explanation of why this answer is invalid? I have watched that part of the explanation video multiple times and still do not understand.

Replies

  1. Slade · 2020-08-20 02:03

    wait is it because the only conclusion that would make this valid would be om -> not P?
  2. shunhe · 2020-08-21 01:43

    Hi @Slade, Thanks for the question! So diagramming the original stimulus, we see that the structure is Volleyball —> Badly sunburned Work today —> ~Badly sunburned Therefore: VP —> ~Work today Which can be abstracted to A —> B C —> ~B Therefore: A —> ~C Which we get by (for example) taking the contrapositive of the second statement and then linking it to the first statement. Now let’s take a look at (B). Diagramming this, we get Promoted —> ~Fail to attend awards banquet Office manager —> ~Promoted Therefore: Office manager —> Fail to attend awards banquet Which can be abstracted as A —> ~B C —> ~A Therefore: C —> B Which is obviously different from the first construction, and actually not even a valid argument (unlike the stimulus). Thus, for this parallel reasoning question, (B) is wrong. Hope this helps! Feel free to ask any other questions that you might have.

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