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

Permutation & Coombination

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 70
Joined: Sat Apr 10, 2010 12:46 pmFollowed by: 2 members
Thanked: 2 times
GMAT Score:730
by gmatmillenium » Sun May 09, 2010 4:15 am
A five digit number is formed using the digits 1,3,5,7 and 9 without repeating any of them. What is the sum of all such possible numbers?

a. 6666600
b. 6666660
c. 6666666
d. 6600000
e. None of the above
Top
Join the discussion
Source: — Problem Solving |
Legendary Member
Posts: 610
Joined: Fri Jan 15, 2010 12:33 amFollowed by: 2 members
Thanked: 47 times

by kstv » Sun May 09, 2010 6:31 am
Total of diff numbers possible = 5!
[spoiler]the smallest no is 13579 and the largest no is 97531
average of 120 nos= (13579+97531)/2
Sum of 120 nos = 111110/2 * 120
= 111110*60[/spoiler]

nice one, some other methods must be tried also.
Top
Join the discussion
User avatar
Legendary Member
Posts: 748
Joined: Sun Jan 31, 2010 7:54 amFollowed by: 3 members
Thanked: 46 times

by outreach » Sun May 09, 2010 7:35 am
add the diff digits
1+3+5+7+9=25 -(1)

total number of digits that can be formed without numbers repeating=5*4*3*2*1=120
divide 120/5=24 -(2)

(2) gives the number of times each digit repears in unit,hundred,thousand etc position

multiple (1) * (2)=25*24=600 -(3)

multiply (3) by 11111(this number depends on the number of digits)

600* 11111=6666600

A should be the answer
gmatmillenium wrote:A five digit number is formed using the digits 1,3,5,7 and 9 without repeating any of them. What is the sum of all such possible numbers?

a. 6666600
b. 6666660
c. 6666666
d. 6600000
e. None of the above
-------------------------------------
--------------------------------------
General blog
https://amarnaik.wordpress.com
MBA blog
https://amarrnaik.blocked/
Top
Join the discussion