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

It is currently 23 Aug 2014, 04:06

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

From a group of 3 boys and 3 girls , 4 children are to be

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 19 May 2004
Posts: 291
Followers: 1

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

GMAT Tests User
From a group of 3 boys and 3 girls , 4 children are to be [#permalink] New post 16 Aug 2004, 12:31
From a group of 3 boys and 3 girls , 4 children are to be randomly selected .
What is the probability that equal number of boys and girls will be selected?
Senior Manager
Senior Manager
avatar
Joined: 25 Jul 2004
Posts: 274
Followers: 1

Kudos [?]: 6 [0], given: 0

GMAT Tests User
 [#permalink] New post 16 Aug 2004, 13:50
I would say

(3C2 * 3C2) / 6C4

= 4/15

the top is the number of ways you can select two of the 3 boys times the number of ways you can select 2 of the 3 girls

the bottom is the number of ways you can select 4 of the six children
Senior Manager
Senior Manager
avatar
Joined: 19 May 2004
Posts: 291
Followers: 1

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

GMAT Tests User
 [#permalink] New post 17 Aug 2004, 08:24
Agree. Same solution.
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 [?]: 58 [0], given: 76084

 [#permalink] New post 17 Aug 2004, 09:13
Wouldn't the correct answer be 9/15? 3C2 =3*3=9
Senior Manager
Senior Manager
avatar
Joined: 19 May 2004
Posts: 291
Followers: 1

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

GMAT Tests User
 [#permalink] New post 17 Aug 2004, 09:27
Yup it's 9/15.
Sorry, I only checked SigEpUCI's way.
He made a little mistake in the final calculation.
Manager
Manager
avatar
Joined: 11 Jul 2004
Posts: 120
Followers: 1

Kudos [?]: 2 [0], given: 0

 [#permalink] New post 17 Aug 2004, 09:39
can someone please explain why is not (3c2 + 3c2) / 6C4
Senior Manager
Senior Manager
avatar
Joined: 19 May 2004
Posts: 291
Followers: 1

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

GMAT Tests User
 [#permalink] New post 17 Aug 2004, 09:46
Use + when you need an "OR", and use * when you need an "AND".
In this question for example, you pick 2 boys AND 2 girls.
That's why you have to multiply.
Manager
Manager
avatar
Joined: 28 Jun 2004
Posts: 90
Followers: 1

Kudos [?]: 2 [0], given: 0

 [#permalink] New post 17 Aug 2004, 09:48
damit wrote:
can someone please explain why is not (3c2 + 3c2) / 6C4


If I am not wrong, as we want 2 boys AND 2 girls, we multiply. Addition is for "OR". Somebody correct me if I am not right.
  [#permalink] 17 Aug 2004, 09:48
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic From a group of 3 boys and 3 girls, 4 children are to be petercao 2 11 Nov 2008, 12:36
1 From a group of 3 boys and 3 girls, 4 children are to be marcodonzelli 3 19 Jan 2008, 10:39
From a group of 3 boys and 3 girls, 4 children are to be GMATCUBS21 4 29 Jun 2006, 04:41
From a group of 3 boys and 3 girls, 4 children are to be M8 7 29 Apr 2006, 20:46
From a group of 3 boys and 3 girls, 4 children are to be Antmavel 3 18 Oct 2004, 05:12
Display posts from previous: Sort by

From a group of 3 boys and 3 girls , 4 children are to be

  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®.