A doctor claims that 60% of the patients he examines are all : GMAT Problem Solving (PS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 04 Dec 2016, 12:24
GMAT Club Tests

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A doctor claims that 60% of the patients he examines are all

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

Hide Tags

Intern
Intern
avatar
Joined: 01 Apr 2012
Posts: 2
Followers: 0

Kudos [?]: 5 [0], given: 1

A doctor claims that 60% of the patients he examines are all [#permalink]

Show Tags

New post 27 Dec 2012, 10:47
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (02:22) correct 0% (00:00) wrong based on 4 sessions

HideShow timer Statistics

A doctor claims that 60% of the patients he examines are allergic to some type of weeds. What is the probability that exactly three of the next 4 patient he examines are allergic to weeds?

It'll be great if problem is solved step by step with explanation.
Expert Post
2 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 7063
Location: Pune, India
Followers: 2083

Kudos [?]: 13262 [2] , given: 221

Re: A doctor claims that 60% of the patients he examines are all [#permalink]

Show Tags

New post 27 Dec 2012, 22:29
2
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
mihir66 wrote:
A doctor claims that 60% of the patients he examines are allergic to some type of weeds. What is the probability that exactly three of the next 4 patient he examines are allergic to weeds?

It'll be great if problem is solved step by step with explanation.


The probability of a person being allergic = 6/10
Probability of a person not being allergic = 4/10

Probability of first person being allergic = 6/10
Probability of second person being allergic = 6/10
Probability of third person being allergic = 6/10
Probability of fourth person not being allergic = 4/10

Probability that exactly 3 of the next 4 people are allergic = (6/10)*(6/10)*(6/10)*(4/10)*4
We multiply by 4 because the non allergic person could be first, second or third. So we need to account for all sequences AAAN, AANA, ANAA, NAAA
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Current Student
User avatar
Joined: 06 Sep 2013
Posts: 2035
Concentration: Finance
GMAT 1: 770 Q0 V
Followers: 60

Kudos [?]: 581 [0], given: 355

GMAT ToolKit User
Re: A doctor claims that 60% of the patients he examines are all [#permalink]

Show Tags

New post 12 May 2014, 06:45
I would guess this question is just (4)(3^3)(2) / (5^3)(5)=216/625

Therefore answer is A (J/K, would be nice to have some answer choices!)

Cheers!
J :)
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 12866
Followers: 559

Kudos [?]: 157 [0], given: 0

Premium Member
Re: A doctor claims that 60% of the patients he examines are all [#permalink]

Show Tags

New post 06 Oct 2016, 15:10
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: A doctor claims that 60% of the patients he examines are all   [#permalink] 06 Oct 2016, 15:10
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic Guy drives 60 miles to attend a meeting. Halfway through, he increases Bunuel 4 08 Nov 2016, 23:03
2 Experts publish their posts in the topic The average score in an examination of 10 students of a class is 60 understandZERO 10 16 Sep 2016, 21:04
1 Experts publish their posts in the topic Joe drives 120 miles at 60 miles per hour, and then he drives the next Bunuel 2 11 Oct 2015, 08:13
23 Experts publish their posts in the topic Kevin drove from A to B at a constant speed of 60 mph. Once he reache Bunuel 17 13 Mar 2015, 06:38
2 In an examination 60% failed in Math and 40% failed in Frenc theGame001 10 01 Aug 2013, 10:35
Display posts from previous: Sort by

A doctor claims that 60% of the patients he examines are all

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


GMAT Club MBA Forum Home| About| 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®.