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

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Sequence DS

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Legendary Member
Posts: 1337
Joined: Sat Dec 27, 2008 6:29 pmFollowed by: 10 members
Thanked: 127 times

by Night reader » Mon Feb 14, 2011 2:01 pm
st(1) 7-3=4 answer NO, but 11-3=9 answer Yes/Not Sufficient;
st(2) n<6 (5,4,3,2,1); 5=a-2 (a is 7), 4=a-7 (a is 11), 3=a-2 (a is 5), 2=a-11 (a is 13), 1=a-2 (a is 3) Sufficient;

answer B
ithamarsorek wrote:I tried to figure out why is this the correct answer but did not come across any satisfactory explanation.


When examining both statements I felt that both can be true. Please help...


Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Junior | Next Rank: 30 Posts
Posts: 26
Joined: Tue Dec 07, 2010 1:01 pm

by ithamarsorek » Mon Feb 14, 2011 2:13 pm
1st part: If they tell me that n is odd, it can be any one of these prime numbers and 2. So why is that incorrect, because it can also be just any of these primes and then it is even?

2nd part: you mean, because we know the range must be less then 6 need to figure which primes under 30 makes n<6 and if there are any? 19-17, 23-19, 3-2, etc... If we find that this kind of #s exist then the statement is correct?

So basically (statement 1 - can be odd or even / no guarantee, statement 2 - must be <6 then we know that those primes are available) ?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1337
Joined: Sat Dec 27, 2008 6:29 pmFollowed by: 10 members
Thanked: 127 times

by Night reader » Mon Feb 14, 2011 2:16 pm
yes
ithamarsorek wrote:1st part: If they tell me that n is odd, it can be any one of these prime numbers and 2. So why is that incorrect, because it can also be just any of these primes and then it is even?

2nd part: you mean, because we know the range must be less then 6 need to figure which primes under 30 makes n<6 and if there are any? 19-17, 23-19, 3-2, etc... If we find that this kind of #s exist then the statement is correct?

So basically (statement 1 - can be odd or even / no guarantee, statement 2 - must be <6 then we know that those primes are available) ?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members
Thanked: 173 times
GMAT Score:710

by gmatmachoman » Mon Feb 14, 2011 10:56 pm
ithamarsorek wrote:I tried to figure out why is this the correct answer but did not come across any satisfactory explanation.


When examining both statements I felt that both can be true. Please help...


Image

It seems the "wordings" in this questions are weird.

St 1 is NOT clear. those numbers can also point to the prime numbers which may not be represented by difference of 2 prime numbers.

For ex" n = 23, now it CAN'T be shown as a difference of 2 prime numbers less than 30.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1