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
Start free 5-day trial
Read 563 reviewsTarget Test Prep

OG Quantitative (Green) #86

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 44
Joined: Thu Nov 20, 2008 2:18 pm
Thanked: 1 times
by mdavis » Mon Feb 02, 2009 11:48 am
Could someone explain the answer to this question?

Can the positive integer n be written as the sum of two different positive prime numbers?

(1) n is greater than 3.
(2) n is odd.
Top
Join the discussion
Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
Posts: 25
Joined: Fri Jan 23, 2009 11:57 am
Location: Minneapolis
Thanked: 1 times

Answer is A

by peddisetty » Mon Feb 02, 2009 5:02 pm
Lets take 4(3+1), 5(3+2),6(5+1), 7(5+2), 8(5+3), 9(7+2), 10(7+3) can all be written as sum of two different prime nos. But 2 cant be written as sum of two different primes.

In A, we have n>3, so its sufficient.

B, is not sufficient. Since 1 is odd, but cant be written as sum of two different primes.

So, the answer is A.
Raj Peddisetty
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 24
Joined: Sun May 11, 2008 10:56 pm

by raptor84 » Mon Feb 02, 2009 8:10 pm
IMO its E.

Take the number 11. This cant be expressed as a sum of two +ve prime numbers right.

So E.

Whats the OA?
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 44
Joined: Thu Nov 20, 2008 2:18 pm
Thanked: 1 times

by mdavis » Mon Feb 02, 2009 8:37 pm
OA is E. The explanation in the book is confusing to me.
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 139
Joined: Wed Oct 22, 2008 4:36 am
Thanked: 17 times

by sacx » Tue Feb 03, 2009 4:03 am
I think it should be E

1. n > 3

Lets say its 11 - cannot be expressed as a sum of prime numbers

2. n is odd

Same example as above can be used

Comine 1 & 2, n = 11 and it fails again
SACX
Top
Join the discussion