Combination

Expert replies

sumasajja: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Wed Jul 20, 2011 12:36 pm; Thanked: 2 times

by sumasajja » Mon Aug 08, 2011 12:06 pm

two different integers are to be selected from a set of ten different integers in which half of the integers are even and half are odd.how many of the 45 possible selections consist of one even and one odd integer?
a]5
b]10
c]20
d]23
e]25

Like this post

Source: Beat The GMAT — Problem Solving | Mon Aug 08, 2011 12:06 pm

GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Mon Aug 08, 2011 12:15 pm

sumasajja wrote:two different integers are to be selected from a set of ten different integers in which half of the integers are even and half are odd.how many of the 45 possible selections consist of one even and one odd integer?

There are 5 different odd integers and 5 different even integers.
For each of the 5 different odd integers we can select any one of 5 different even integers. Hence, total number of selections in which one integer is odd and the other one is even is 5*5 = 25

The correct answer is E.

Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/

Like this post

sumasajja: Senior | Next Rank: 100 Posts; Posts: 54; Joined: Wed Jul 20, 2011 12:36 pm; Thanked: 2 times

by sumasajja » Mon Aug 08, 2011 12:32 pm

thanks anurag sir

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review