HELP : Ask GMAT Experts
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 23 Jan 2017, 17:24

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# HELP

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Intern
Joined: 15 Aug 2012
Posts: 2
Followers: 0

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

HELP [#permalink]

### Show Tags

15 Aug 2012, 18:25
35) There are 12 boys and 16 girls in one class, and 15 boys and 14 girls in another. How many ways can a boy-girl pair be chosen, if the boy has to be from one class and the girl from the other?
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7130
Location: Pune, India
Followers: 2140

Kudos [?]: 13706 [0], given: 222

Re: HELP [#permalink]

### Show Tags

15 Aug 2012, 20:44
dualvessilva wrote:
35) There are 12 boys and 16 girls in one class, and 15 boys and 14 girls in another. How many ways can a boy-girl pair be chosen, if the boy has to be from one class and the girl from the other?

The only condition is that the boy and the girl must be from different classes.

Class 1 - 12 boys and 16 girls
Class 2 - 15 boys and 14 girls

You can do it in 2 ways: Pick a boy from Class 1 and girl from class 2 OR pick a girl from class 1 and boy from class 2.

Number of ways of picking a boy from Class 1 and girl from class 2 = 12*14
Number of ways of picking a girl from class 1 and boy from class 2 = 16*15

Total number of ways = 12*14 + 16*15

We are just using the basic counting principle here. Check this link for more: http://www.veritasprep.com/blog/2011/10 ... inatorics/
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for \$199

Veritas Prep Reviews

Re: HELP   [#permalink] 15 Aug 2012, 20:44
Similar topics Replies Last post
Similar
Topics:
Help! 2 19 Aug 2015, 06:24
2 Please help 5 13 Jun 2012, 18:37
Please help 1 15 May 2012, 18:40
please help 5 06 May 2012, 23:50
Need help 4 23 Jan 2012, 19:47
Display posts from previous: Sort by

# HELP

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.