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

Redeem

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.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

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