Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

CR Circular Argument

Expert replies
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.
Join the discussion
Source: — Critical Reasoning |

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

What's the OA?
Join the discussion

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.
Join the discussion

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.
Join the discussion

by TrizMA » Mon Jun 30, 2008 2:41 pm
durgesh, pls tell the OA
Join the discussion

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.
Join the discussion

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
Join the discussion

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."
Join the discussion

by khanshainur » Wed May 11, 2016 12:30 am
Don’t have much explanation for it, D seems good
Join the discussion