A valid argument is often defined as one in which it is not : GMAT Critical Reasoning (CR)
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A valid argument is often defined as one in which it is not

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

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05 Jan 2005, 12:56
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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.
If you have any questions
New!
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05 Jan 2005, 13:56
Premise = P; Conclusion = C

Valid argument
At least 1 P(False) and C(True)

Circular:
At least 1 P(False) AND C(False)
OR At least 1 P(True) AND C(true)

I'll go with option E
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05 Jan 2005, 14:01
good one, I am tempted to go with D. I will wait for OA
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Praveen

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05 Jan 2005, 14:32
OA is A.
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05 Jan 2005, 14:35
gayathri wrote:
OA is A.

Could you please post the explaination as well?

Thanks in anticipation.
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05 Jan 2005, 14:40
maaverick wrote:

Could you please post the explaination as well?

Thanks in anticipation.

Just waiting for some more people to express their opinion
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05 Jan 2005, 20:10
wow. i am totally lost on this one .. why is it A????
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05 Jan 2005, 21:07
The English part of the argument was very confusing to me. I hope I did not understand the passage wrong and got the answer right by mistake.
Looking forward for a good explanation

The way I understood the reasoning
Premise is true => Conclusion is true
Premise is false => Conclusion is false

If the premise is true and the conclusion which is the premise is true therefore the circular argument is valid (A).

- Joe
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05 Jan 2005, 22:50
makes perfect sense in the hind sight.

Author never mentions circular arguements are incorrect.
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Praveen

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05 Jan 2005, 23:00
thats a tricky one. originally had E in mind, but i can see why it is A. great explanation joebaak.
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06 Jan 2005, 05:53
joebaak good explanation.

The stem says that
In a Valid argument: Premises true then conclusion is true.
In a Circular argument: Premises are similar to conclusion.

So, if the presmises in a circular argument are true then the conclusion is true => it is a valid argument. This is exactly what A is saying.
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06 Jan 2005, 06:06
good explanation. thanks folks.
06 Jan 2005, 06:06
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