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

It is currently 23 Jul 2014, 10:35

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

Two integers will be randomly selected from the sets above,

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
Manager
Manager
avatar
Joined: 02 Dec 2012
Posts: 178
Followers: 2

Kudos [?]: 174 [1] , given: 0

Two integers will be randomly selected from the sets above, [#permalink] New post 02 Dec 2012, 06:51
1
This post received
KUDOS
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (02:01) correct 21% (01:07) wrong based on 168 sessions
A = {2, 3, 4, 5}
B = {4, 5, 6, 7, 8}

Two integers will be randomly selected from the sets above, one integer from set A and one integer from set B. What is the probability that the sum of the two integers will equal 9 ?

(A) 0.15
(B) 0.20
(C) 0.25
(D) 0.30
(E) 0.33
[Reveal] Spoiler: OA
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18703
Followers: 3236

Kudos [?]: 22272 [0], given: 2610

Re: Two integers will be randomly selected from the sets above, [#permalink] New post 02 Dec 2012, 06:52
Expert's post
1
This post was
BOOKMARKED
Walkabout wrote:
A = {2, 3, 4, 5}
B = {4, 5, 6, 7, 8}

Two integers will be randomly selected from the sets above, one integer from set A and one integer from set B. What is the probability that the sum of the two integers will equal 9 ?

(A) 0.15
(B) 0.20
(C) 0.25
(D) 0.30
(E) 0.33


The total number of pairs possible is 4*5=20. Out of these 20 pairs only 4 sum up to 9: (2, 7); (3, 6), (4, 5) and (5, 4). The probability thus is 4/20=0.2.

Answer: B.

_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

1 KUDOS received
Intern
Intern
avatar
Joined: 18 Feb 2012
Posts: 12
Followers: 0

Kudos [?]: 1 [1] , given: 2

Re: Two integers will be randomly selected from the sets above, [#permalink] New post 02 Dec 2012, 17:51
1
This post received
KUDOS
How about this line of thought:

I pick a number from Set A. No matter which number I pick, my chance of chosing the right number (which gives A+B = 9) in Set B will be 1/5.

Therefore 1/5 = 0.20 => B
Intern
Intern
avatar
Joined: 15 Oct 2013
Posts: 2
Concentration: Marketing, Finance
Schools: McCombs '16
Followers: 0

Kudos [?]: 0 [0], given: 7

CAT Tests
probability sum is equal to 9 [#permalink] New post 15 Feb 2014, 05:29
hi
the question is as below

a={2,3,4,5}
b={4,5,6,7,8}

Two integers will randomly selected from the sets above, one integer from set A and one integer from set B. what is the probability that the sum of the two integers will equal 9.
a)0.15
b)0.20
c)0.25
d)0.30
e)0.33

I want to understand how will we calculate the total outcomes.
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18703
Followers: 3236

Kudos [?]: 22272 [0], given: 2610

Re: probability sum is equal to 9 [#permalink] New post 15 Feb 2014, 05:33
Expert's post
mightymk wrote:
hi
the question is as below

a={2,3,4,5}
b={4,5,6,7,8}

Two integers will randomly selected from the sets above, one integer from set A and one integer from set B. what is the probability that the sum of the two integers will equal 9.
a)0.15
b)0.20
c)0.25
d)0.30
e)0.33

I want to understand how will we calculate the total outcomes.


Merging similar topics. Please refer to the solutions above.

P.S. Please read carefully and follow: rules-for-posting-please-read-this-before-posting-133935.html Pay attention to rules 1 and 3. Thank you.

_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: probability sum is equal to 9   [#permalink] 15 Feb 2014, 05:33
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic Two integers will be randomly selected from sets A and B 2013gmat 5 24 Oct 2012, 21:05
15 Experts publish their posts in the topic Two integers will be randomly selected from the sets above vermatanya 20 17 Jan 2008, 13:50
4 Experts publish their posts in the topic If an integer is to be randomly selected from set M above marcodonzelli 10 12 Jan 2008, 04:29
If two numbers are randomly selected from set (1, 2, 3, 4, bmwhype2 1 23 Oct 2007, 11:32
If two different numbers are randomly selected from a set BG 9 02 Jun 2005, 08:08
Display posts from previous: Sort by

Two integers will be randomly selected from the sets above,

  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®.