GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Oct 2018, 09:47

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

A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick

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

Hide Tags

Manager
Manager
User avatar
S
Status: The journey is always more beautiful than the destination
Affiliations: Computer Science
Joined: 24 Apr 2017
Posts: 54
Location: India
Concentration: Statistics, Strategy
GMAT 1: 570 Q40 V28
GPA: 3.14
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post Updated on: 09 Apr 2018, 01:21
2
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

96% (00:43) correct 4% (01:07) wrong based on 116 sessions

HideShow timer Statistics

A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red or a black ball?


a. 7/19
b. 9/19
c. 10/19
d. 11/19
e. 12/19


Source- time4education

_________________

Sky is the limit. 800 is the limit.


Originally posted by Nixondutta on 08 Apr 2018, 23:56.
Last edited by Bunuel on 09 Apr 2018, 01:21, edited 1 time in total.
Edited the question.
Manager
Manager
avatar
S
Joined: 05 Feb 2016
Posts: 144
Location: India
Concentration: General Management, Marketing
WE: Information Technology (Computer Software)
GMAT ToolKit User CAT Tests
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post 09 Apr 2018, 00:27
Nixondutta wrote:
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red or a black ball?
Source- time4education


a.7/19
b.9/19
c.10/19
d.11/19
e.12/19


probablity=\(\frac{(7C1+3C1)}{(19C1)}\)

option C
Manager
Manager
avatar
S
Joined: 27 Aug 2014
Posts: 131
Concentration: Finance, Strategy
GPA: 3.9
WE: Analyst (Energy and Utilities)
CAT Tests
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post 04 Jun 2018, 13:55
P(AorB) = P(A)+P(B)-P(A and B)

total balls =19
probablity of chooisng a red ball = 7/19 = P(A)
probablity of choosing a black ball = 3/19 = P(B)
probability of choosing a black and red ball = 0 (not possible as it either be red or black)

P(A or B) = 7/19 + 3/19 -0 = 10/19

so C



Nixondutta wrote:
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red or a black ball?


a. 7/19
b. 9/19
c. 10/19
d. 11/19
e. 12/19


Source- time4education
Director
Director
User avatar
P
Joined: 27 May 2012
Posts: 583
Premium Member
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post 29 Aug 2018, 07:44
Nixondutta wrote:
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red or a black ball?


a. 7/19
b. 9/19
c. 10/19
d. 11/19
e. 12/19


Source- time4education


Dear Moderator,
While going through the combinations forum, found this probability question. Hope you will do the needful. Thank you.
_________________

- Stne

Manager
Manager
User avatar
S
Joined: 20 Jul 2018
Posts: 90
GPA: 2.87
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post 29 Aug 2018, 08:54
total possible outcomes=19
desirable outcomes=7+3=10
probability=10/19
_________________

Hasnain Afzal

"When you wanna succeed as bad as you wanna breathe, then you will be successful." -Eric Thomas

Director
Director
User avatar
G
Joined: 20 Feb 2015
Posts: 793
Concentration: Strategy, General Management
Premium Member
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post 29 Aug 2018, 11:37
Nixondutta wrote:
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red or a black ball?


a. 7/19
b. 9/19
c. 10/19
d. 11/19
e. 12/19


Source- time4education


required probability
P(red) + p(black)= 7/19 + 3/19 = 10/19
Target Test Prep Representative
User avatar
G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2830
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

Show Tags

New post 03 Sep 2018, 19:00
Nixondutta wrote:
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is picked at random, what is the probability that the ball drawn will be either a red or a black ball?


a. 7/19
b. 9/19
c. 10/19
d. 11/19
e. 12/19


The probability of selecting either a red or black ball is 7/19 + 3/19 = 10/19.

Answer: C
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

GMAT Club Bot
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick &nbs [#permalink] 03 Sep 2018, 19:00
Display posts from previous: Sort by

A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| 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®.