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

It is currently 16 Apr 2014, 08:29

Hurry Up:

Last day of registration for Dealing with a Ding - Webinar by GMATClub and Admissionado Consulting.


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

Pick 5 numbers at random from integers 1 to 20. What is the

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
Joined: 28 May 2004
Posts: 9
Location: NC
Followers: 0

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

Pick 5 numbers at random from integers 1 to 20. What is the [#permalink] New post 14 Sep 2004, 07:03
Pick 5 numbers at random from integers 1 to 20. What is the probability that the 5 numbers picked includes the numbers 10 & 20?
Intern
Intern
Joined: 28 May 2004
Posts: 9
Location: NC
Followers: 0

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

 [#permalink] New post 14 Sep 2004, 07:09
Nevermind! I found the same question posted earlier. Heres the link but I'm not sure about the answer. Lovely - Can you please explain a bit more on how you arrived at the solution?

http://www.gmatclub.com/phpbb/viewtopic.php?t=9774
Director
Director
Joined: 20 Jul 2004
Posts: 594
Followers: 1

Kudos [?]: 15 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Sep 2004, 08:45
lovely wrote:
mba4me wrote:
Pick 5 numbers from 1 to 20 (integer), what is the probability that the 5 numbers include 10 and 20?

i would say: 20c2/20c5
is there a good chance of anything like this on the gmat?


Is this the OA?
I did as below:

Pb of getting 10 and 20
= 1 - Pb of not getting 10 and 20
= 1 - 18C5/20C5
SVP
SVP
User avatar
Joined: 16 Oct 2003
Posts: 1818
Followers: 3

Kudos [?]: 26 [0], given: 0

GMAT Tests User
 [#permalink] New post 15 Sep 2004, 07:51
48/273

Whats the OA?
Joined: 31 Dec 1969
Location: United States
Concentration: Marketing, Other
GMAT 1: 710 Q49 V38
GMAT 2: 660 Q V
GPA: 3.64
WE: Accounting (Accounting)
Followers: 0

Kudos [?]: 46 [0], given: 72009

 [#permalink] New post 15 Sep 2004, 08:11
OA - 17/38. I think hardworkers method fetches me the OA. Thanks guys!
Manager
Manager
Joined: 21 Aug 2004
Posts: 136
Followers: 1

Kudos [?]: 5 [0], given: 0

 [#permalink] New post 15 Sep 2004, 09:50
The snwer shd be 19C3/21C5. We shd not forget tht between 1 and 20, there are 21 numbers.
Director
Director
User avatar
Joined: 31 Aug 2004
Posts: 611
Followers: 2

Kudos [?]: 12 [0], given: 0

GMAT Tests User
 [#permalink] New post 18 Sep 2004, 15:07
Sdanquah : there are 20 numbers between 1 and 20, remember the formula (last-first)+1= 20-1+1= 20

Could someone please explain the OA ?

I used the same way as hardworker with 1- prob not to be selected =
1- 18C5/20C5 and obtained 21/38
Director
Director
Joined: 20 Jul 2004
Posts: 594
Followers: 1

Kudos [?]: 15 [0], given: 0

GMAT Tests User
 [#permalink] New post 18 Sep 2004, 20:50
twixt wrote:
Sdanquah : there are 20 numbers between 1 and 20, remember the formula (last-first)+1= 20-1+1= 20

Could someone please explain the OA ?

I used the same way as hardworker with 1- prob not to be selected =
1- 18C5/20C5 and obtained 21/38


1- 18C5/20C5
= 1 - 15x14/20x19
= 1 - 21/38
= 17/38

I think you forgot to subtract from 1 :wink:
  [#permalink] 18 Sep 2004, 20:50
    Similar topics Author Replies Last post
Similar
Topics:
Popular new posts Select 5 numbers from the series of 1 to 20 (inclusive). carsen 10 12 Jul 2004, 07:25
New posts Pick 5 numbers from 1 to 20 (integer), what is the mba4me 9 13 Sep 2004, 12:20
New posts If an integer n is to be chosen at random from integers 1 to AJB77 7 05 Jul 2005, 14:30
New posts Seven integers are picked at random from the set of all u2lover 4 08 Aug 2006, 17:52
New posts Seven integers are picked at random from the set of all bz9 1 15 Feb 2007, 03:32
Display posts from previous: Sort by

Pick 5 numbers at random from integers 1 to 20. What is the

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| 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®.