BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

CR Circular Argument

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 167
Joined: Tue Apr 22, 2008 12:48 am
Thanked: 15 times

CR Circular Argument

by durgesh79 » Sat Jun 28, 2008 11:38 pm
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.
Top
Source: — Critical Reasoning |
Senior | Next Rank: 100 Posts
Posts: 36
Joined: Sun Jun 22, 2008 5:47 am

by TrizMA » Sun Jun 29, 2008 5:09 am
my pick is A.

What's the OA?
Top
Senior | Next Rank: 100 Posts
Posts: 76
Joined: Mon Jun 30, 2008 4:31 am
Location: India
Thanked: 2 times

by Aldiablo » Mon Jun 30, 2008 5:04 am
IMO D

I discarded 'A' because in valid argument all the premises cannot be true.
When you think you can or you cannot, you are generally correct.
Top
Junior | Next Rank: 30 Posts
Posts: 15
Joined: Fri Jun 20, 2008 5:46 am

by pinktoadette » Mon Jun 30, 2008 6:50 am
E? If negate E, it becomes some circular arguments are valid, and some valid arguments are circular... and for the words "some" it can be a reciprocal...

for circular arguments -> premise = false, and conclusion = false, therefore premis = conclusion
for valid arguments -> premise = not possible for all to be true, therefore COULD be false,.. if premise is false, and conclusion MUST befalse, then premise = conclusion...

so some valid argument can be circular...

------------------------------------------------------------------------

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.
Top
Senior | Next Rank: 100 Posts
Posts: 36
Joined: Sun Jun 22, 2008 5:47 am

by TrizMA » Mon Jun 30, 2008 2:41 pm
durgesh, pls tell the OA
Top
Master | Next Rank: 500 Posts
Posts: 438
Joined: Mon Feb 12, 2007 9:44 am
Thanked: 26 times

by chidcguy » Mon Jun 30, 2008 4:19 pm
My pick is D. What is the OA?
Please do not post answer along with the Question you post/ask

Let people discuss the Questions with out seeing answers.
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 2623
Joined: Mon Jun 02, 2008 3:17 am
Location: Montreal
Thanked: 1090 times
Followed by:355 members
GMAT Score:780

by Ian Stewart » Mon Jun 30, 2008 6:49 pm
Certainly A. I posted the following to another forum:

durgesh79 wrote:
A circular argument is sometimes defined as one in which one of the premises is identical to the conclusion.

So, in a circular argument, if the premises are all true, the conclusion must be true: the conclusion is the same as one of the premises.

durgesh79 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.

Since the conclusion of a circular argument is the same as one of the premises, if the premises are all true, the conclusion cannot be false. Thus, circular arguments are 'valid arguments', according to the definitions. A.

There was then some discussion... to see the full dialogue, go to:

gmatclub.com/forum/11-t66352
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com
Top
Master | Next Rank: 500 Posts
Posts: 167
Joined: Tue Apr 22, 2008 12:48 am
Thanked: 15 times

by durgesh79 » Mon Jun 30, 2008 8:44 pm
Thanks Ian.

the OA is A. Below is the OE, which i dint understand.

"(A) Some people find this paradoxical, but it follows directly that circular arguments are valid. If the premises are true, and the conclusion is one if the premises, it must be true. Another trick here is the word 'valid'. Just because an argument is valid, does not mean it is true. Many people will make that false assumption and be thrown off on this question."
Top
Master | Next Rank: 500 Posts
Posts: 300
Joined: Fri Aug 09, 2013 2:26 am

by khanshainur » Wed May 11, 2016 12:30 am
Don't have much explanation for it, D seems good
Top
Post new topic Post Reply
• Page 1 of 1