It is currently 24 Nov 2017, 00:49

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Joshua and Jose work at an auto repair center with 4 other

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

SVP
SVP
User avatar
B
Joined: 06 Nov 2014
Posts: 1904

Kudos [?]: 542 [0], given: 23

Re: Joshua and Jose work at an auto repair center with 4 other [#permalink]

Show Tags

New post 31 Mar 2015, 02:30
aiming700plus wrote:
Joshua and Jose work at an auto repair center with 4 other workers. For a survey on health care insurance, 2 of the 6 workers will be randomly chosen to be interviewed. What is the probability that Joshua and Jose will both be chosen?

A. 1/15
B. 1/12
C. 1/9
D. 1/6
E. 1/3


No. of ways in which Joshua and Jose can be chosen out of 2 people = 2C2 = 1
No. of ways in which Joshua and Jose can be chosen out of 6 people = 6C2 = 15
Required probability = 1/15

Hence option (A).

--
Optimus Prep's GMAT On Demand course for only $299 covers all verbal and quant. concepts in detail. Visit the following link to get your 7 days free trial account: http://www.optimus-prep.com/gmat-on-demand-course

Kudos [?]: 542 [0], given: 23

Manager
Manager
avatar
B
Joined: 15 Dec 2016
Posts: 62

Kudos [?]: 7 [0], given: 5

Re: Joshua and Jose work at an auto repair center with 4 other [#permalink]

Show Tags

New post 15 Sep 2017, 12:27
Hi - why doesnt the following work

(1/6) * (1/5) = 1/30

just wondering why this didnt work ...

Kudos [?]: 7 [0], given: 5

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42356

Kudos [?]: 133182 [0], given: 12438

Re: Joshua and Jose work at an auto repair center with 4 other [#permalink]

Show Tags

New post 16 Sep 2017, 04:24
jabhatta@umail.iu.edu wrote:
Hi - why doesnt the following work

(1/6) * (1/5) = 1/30

just wondering why this didnt work ...


What is the logic behind this?

If you say that 1/6 is the probability of choosing Joshua first and 1/5 is the probability of choosing Jose second, then you are missing a case when you are choosing Jose first and Joshua second, so 1/6*1/5 + 1/6*1/5 = 1/15.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 133182 [0], given: 12438

Manager
Manager
avatar
B
Joined: 06 Aug 2017
Posts: 73

Kudos [?]: 13 [0], given: 27

GMAT 1: 610 Q48 V24
Re: Joshua and Jose work at an auto repair center with 4 other [#permalink]

Show Tags

New post 16 Sep 2017, 10:21
Total combinations = 6C2 = 15
Only 1 our of this combination will have Joshua and Jose both chosen = 1
Probability = 1/15
Hence A
_________________

-------------------------------------------------------------------------------
Kudos are the only way to tell whether my post is useful.

Kudos [?]: 13 [0], given: 27

Intern
Intern
User avatar
Joined: 11 Nov 2016
Posts: 4

Kudos [?]: [0], given: 3

Re: Joshua and Jose work at an auto repair center with 4 other [#permalink]

Show Tags

New post 16 Sep 2017, 11:56
2x1/6x1/5 = 1/15
Joshua chosen first and then Jose and Viz.

Kudos [?]: [0], given: 3

Re: Joshua and Jose work at an auto repair center with 4 other   [#permalink] 16 Sep 2017, 11:56

Go to page   Previous    1   2   [ 25 posts ] 

Display posts from previous: Sort by

Joshua and Jose work at an auto repair center with 4 other

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


cron

GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.