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Thread: Logic quiz

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    Logic quiz

    Arm-Chair Logic

    (93% here. Seems logical enough.)

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    Re: Logic quiz

    >Seems logical enough
    I think the text is on very shaky grounds.
    e.g. (13)Not a single animal uses language
    The premise appears to be that humans are not considered as animals. We know that they are animals, but the premise is undermined by the doubt raised by the phrasing.
    I was thinking of raising a similar point about Kangaroos. If asked I would call them "marsupials" rather than "mammals" "invertebrates" or 'chordates" which I think they are.
    That is, by using an intermediate description the premise clouds the discussion.

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    Re: Logic quiz

    Remember, this quiz is not about individual statements being true/correct or false/wrong. Within the context of the quiz, the statements a), etc. are givens, we do not need to question them (some are obviously false/wrong but we should ignore that).
    Instead, we have to decide whether the conclusion follows logically from the premises.

    (I think the last one, #15, is rather doubtful)

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    Re: Logic quiz

    I found this fairly easy, but we had a whole module on this stuff when I did my degree in Philosophy!

    StuartR

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    Re: Logic quiz

    100% for me although #15 made me think for a bit
    Jerry

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    Re: Logic quiz

    > (I think the last one, #15, is rather doubtful)

    "Therefore we can predict"

    Well, yes.
    If it was "Therefore we can predict with 100% accuracy" ....

    I mean.
    "I predict that I'll earn $5,000,000,000,000,000,000 tomorrow" is valid.
    I do, indeed predict that.
    But unless Stuart comes to claim his prize ......

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    Re: Logic quiz

    #15 was the one that stumped me. A wrong guess.

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    Re: Logic quiz

    93% also. I got #10 wrong, because the question must contain the (unspecified) assumption that there is only one "Paris" for the logic to be valid.

    Alan

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    Re: Logic quiz

    Alan,

    They ALL have similar assumptions, #1 assumes there is only one Donald and #3 assumes there is only one Gary for example. You need to think of these labels as being like variables in a programming language, not the names of real people and places.

    StuartR

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    Re: Logic quiz

    >"I predict that I'll earn $5,000,000,000,000,000,000 tomorrow"

    Selling your cat Chris ??? <img src=/S/grin.gif border=0 alt=grin width=15 height=15>
    <IMG SRC=http://www.wopr.com/w3tuserpics/DocWatson_sig.gif>

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    Re: Logic quiz

    OK, in that case I'll give the quiz some latitude and award myself 100%. <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

    Alan

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    Re: Logic quiz

    It is an assumption behind all these questions that if the same word is used in both statements it means the same thing each time.

    If you replace Paris with XX you would take it for granted that XX refers to the same place each time.

    Reword this as:
    Question 10.
    a) Jenny lives in XX.
    XX is in New Zealand.

    Conclusion
    Therefore Jenny lives in New Zealand.
    Regards
    John



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    Re: Logic quiz

    93%. I got no. 13 wrong. The answer is followed by this statement: “But we can say that 'not all' reasoning beings employ generalisations.” If this is the case then surely some do? So why is the answer then not valid?

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    Re: Logic quiz

    The conclusion "Therefore reasoning beings employ generalisations" says that *all* reasoning beings employ generalisations.
    But *some* reasoning beings are animals , hence they don't use language (, so they don't employ generalisations (a).

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    Re: Logic quiz

    Agreed. And had the assumption been explicitly stated, then there would be no room for ambiguity in interpretation.

    Alan

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