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A valid argument is often defined as one in which it is not

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Intern
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A valid argument is often defined as one in which it is not [#permalink]

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New post 19 Nov 2007, 17:24
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E

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A valid argument is often defined as one in which it is not possible for all the premises to be true and the conclusion false. A circular argument is sometimes defined as one in which one of the premises is identical to the conclusion. From these definitions we can infer that…

A. Every circular argument is valid as long as its premises are true.
B. Every valid argument is circular.
C. No circular argument is valid.
D. Some circular arguments are valid, and some are not.
E. Some circular arguments are not valid, and some valid arguments are not circular.


Please post explanations. This one makes me dizzy!!!!
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Re: CR - Argument (Hard one!) [#permalink]

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New post 19 Nov 2007, 20:14
finder_003 wrote:
A valid argument is often defined as one in which it is not possible for all the premises to be true and the conclusion false. A circular argument is sometimes defined as one in which one of the premises is identical to the conclusion. From these definitions we can infer that…

A. Every circular argument is valid as long as its premises are true.
B. Every valid argument is circular.
C. No circular argument is valid.
D. Some circular arguments are valid, and some are not.
E. Some circular arguments are not valid, and some valid arguments are not circular.


Please post explanations. This one makes me dizzy!!!!


I would go with E.
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 [#permalink]

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New post 19 Nov 2007, 21:58
i take E.
in a circular argument, if the premise is true than the conclusion is true, let it be that premise is the same as conclusion (Vaild argument). However circular argument can also be false if the premise is false than the conclusion is also false(invaild argument). So some circular argument can be vaild and some are not.
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 [#permalink]

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New post 20 Nov 2007, 09:17
E is what I thought as well.

But the OA is A!!!!

Can anyone please please post a detailed explanation of why A could possibly be right??
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 [#permalink]

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New post 20 Nov 2007, 13:02
I went for A..let me explain how
for valid argument..
if all premises==true then conclusion != false

for circular argument
one of the premise = conclusion

therefore if all the premises are true..then for a circular argument one of those premises will be the conclusion and as all the premises are true => the conclusion is also true.
Hence if all the premises are true a circular argument is a valid argument ! !!
  [#permalink] 20 Nov 2007, 13:02
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A valid argument is often defined as one in which it is not

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