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 →

Need clarification on formula

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 66
Joined: Sun Jun 29, 2008 8:37 pm
Location: India
Thanked: 1 times
by msd_2008 » Sun Dec 07, 2008 6:23 pm
Can someone please explain to me how the following formulas differ in their applicability? Are both the formulas correct?

True # of objects = (total # in group 1) + (total # in group 2) + (total # in group 3) + (total # in none of the groups) - (# in only groups 1&2) - (# in only groups 1&3) - (# in only groups 2&3) - 2(# in all 3 groups)

AUBUC = A + B + C - AB - AC - BC + None - All.........note that we are not subtracting 2xAll in this formula.


Regards
MSD
When the going gets tough, the tough gets going.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Community Manager
Posts: 1049
Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members
Location: Pittsburgh, PA
Thanked: 113 times
GMAT Score:710

by dmateer25 » Sun Dec 07, 2008 6:50 pm
https://www.beatthegmat.com/very-interst ... t9806.html

Check this post. Stuart and Ron have a discussion on these formulas.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 66
Joined: Sun Jun 29, 2008 8:37 pm
Location: India
Thanked: 1 times

by msd_2008 » Sun Dec 07, 2008 7:09 pm
I did go through the post. However, my query is still unresolved.
The post discussed a completely different question.....

Regards
MSD
When the going gets tough, the tough gets going.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 1049
Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members
Location: Pittsburgh, PA
Thanked: 113 times
GMAT Score:710

by dmateer25 » Sun Dec 07, 2008 7:17 pm
AUBUC = A + B + C - AB - AC - BC + None - All

Where did you come up with this?

It should be:

AUBUC = A + B + C - {A n B + B n C + C n A} + A n B n C



AUBUC = A + B + C - AB - AC - BC + None - 2(All): this formula is only applicable only when the groups are exlusive.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 833
Joined: Mon Aug 04, 2008 1:56 am
Thanked: 13 times

by vivek.kapoor83 » Mon Dec 08, 2008 10:14 am
dmateer25 wrote:AUBUC = A + B + C - AB - AC - BC + None - All

Where did you come up with this?

It should be:

AUBUC = A + B + C - {A n B + B n C + C n A} + A n B n C



AUBUC = A + B + C - AB - AC - BC + None - 2(All): this formula is only applicable only when the groups are exlusive.
Dmatter,
pls elaborate wht dp u mean by exclusive groups ?

and
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 1049
Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members
Location: Pittsburgh, PA
Thanked: 113 times
GMAT Score:710

by dmateer25 » Tue Dec 09, 2008 3:36 am
This is a quote from Ron.
before using the formula, just verify that 'group1&2', etc. are EXCLUSIVE; in other words, that they refer to the members of EXACTLY two groups. this is something that can't be implied; the evidence must be found explicitly in the problem statement. (in this problem, the evidence is '...exactly two classes')
This quote refers to this formula:

AUBUC = A + B + C - AB - AC - BC + None - 2(All)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1