Find all School-related info fast with the new School-Specific MBA Forum

It is currently 27 May 2016, 08:24
GMAT Club Tests

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Selecting 5 students at a time, x students can be arranged

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
User avatar
Joined: 25 Nov 2004
Posts: 1493
Followers: 6

Kudos [?]: 70 [0], given: 0

Selecting 5 students at a time, x students can be arranged [#permalink]

Show Tags

New post 08 Feb 2005, 23:10
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Selecting 5 students at a time, x students can be arranged in 30240 ways. How many groups can be created selecting the same students at a time.
Manager
Manager
avatar
Joined: 01 Jan 2005
Posts: 167
Location: NJ
Followers: 1

Kudos [?]: 3 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 06:42
HongHu plz explain.
SVP
SVP
User avatar
Joined: 03 Jan 2005
Posts: 2243
Followers: 16

Kudos [?]: 278 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 07:55
Is this correct that P(m,n)=C(m,n)*n!?
VP
VP
avatar
Joined: 18 Nov 2004
Posts: 1440
Followers: 2

Kudos [?]: 30 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 09:58
Given.....xP5 = 30240....asking xC5

We know nPr = nCr * r!

So xC5 = 30240/5!
Intern
Intern
avatar
Joined: 27 Dec 2004
Posts: 21
Followers: 0

Kudos [?]: 0 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 12:03
same answer from me too.
Director
Director
avatar
Joined: 19 Nov 2004
Posts: 559
Location: SF Bay Area, USA
Followers: 4

Kudos [?]: 124 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 14:59
I don't follow this:
"How many groups can be created selecting the same students at a time."
Can somebody explain?
VP
VP
avatar
Joined: 18 Nov 2004
Posts: 1440
Followers: 2

Kudos [?]: 30 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 15:22
nocilis wrote:
I don't follow this:
"How many groups can be created selecting the same students at a time."
Can somebody explain?


First part is abt arranging 5 students at a time e.g. arranging them in a row, where order matters so it XP5....second it is creating gps of 5, no order is necessary...so combination i.e. XC5
Director
Director
avatar
Joined: 19 Nov 2004
Posts: 559
Location: SF Bay Area, USA
Followers: 4

Kudos [?]: 124 [0], given: 0

 [#permalink]

Show Tags

New post 09 Feb 2005, 17:14
Thanks Banerjee
Is is group of 5? That part is still not clear to me.
  [#permalink] 09 Feb 2005, 17:14
Display posts from previous: Sort by

Selecting 5 students at a time, x students can be arranged

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.