It is currently 23 Sep 2017, 09:54

Happening Now:

Alleviate MBA app anxiety! Come to Chat Room #2


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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

GMATPREP:Permutaion & combination

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
User avatar
Joined: 18 May 2008
Posts: 1262

Kudos [?]: 511 [0], given: 0

GMATPREP:Permutaion & combination [#permalink]

Show Tags

New post 29 Jan 2009, 04:18
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Pls explain ur answers
Attachments

code.JPG
code.JPG [ 62.85 KiB | Viewed 1007 times ]

Kudos [?]: 511 [0], given: 0

SVP
SVP
avatar
Joined: 17 Jun 2008
Posts: 1540

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

Re: GMATPREP:Permutaion & combination [#permalink]

Show Tags

New post 29 Jan 2009, 05:30
It will be 26 + (26*26) + (26*26*26)
= 18278

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

1 KUDOS received
SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1795

Kudos [?]: 1034 [1], given: 5

Location: New York
Re: GMATPREP:Permutaion & combination [#permalink]

Show Tags

New post 29 Jan 2009, 08:30
1
This post received
KUDOS
scthakur wrote:
It will be 26 + (26*26) + (26*26*26)
= 18278


Same approach.

just my 2 cents.. no need to calculate/multiple..
26 + (26*26) + (26*26*26) --> all these end with unit digit 6.
SUM OF THESE THREE NUMBERS must be NUMBR with unit digit 8
only one option available.
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

Kudos [?]: 1034 [1], given: 5

VP
VP
User avatar
Joined: 18 May 2008
Posts: 1262

Kudos [?]: 511 [0], given: 0

Re: GMATPREP:Permutaion & combination [#permalink]

Show Tags

New post 29 Jan 2009, 10:33
+1 for this shortcut.
x2suresh wrote:
scthakur wrote:
It will be 26 + (26*26) + (26*26*26)
= 18278


Same approach.

just my 2 cents.. we no need to calculate/multiple..
26 + (26*26) + (26*26*26) --> all these end with unit digit 6.
so sum's last digit must be 8 only one option available.

Kudos [?]: 511 [0], given: 0

Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 879

Kudos [?]: 815 [0], given: 18

Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: GMATPREP:Permutaion & combination [#permalink]

Show Tags

New post 01 Feb 2009, 07:00
So..one thing to note here...may be people already know.

Permutation formula nPr = n! / (n-r)! doesnt consider repetitions :)

Kudos [?]: 815 [0], given: 18

Re: GMATPREP:Permutaion & combination   [#permalink] 01 Feb 2009, 07:00
Display posts from previous: Sort by

GMATPREP:Permutaion & combination

  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 | Emoji artwork provided by EmojiOne

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®.