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

It is currently 18 Oct 2019, 01:44

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

There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58435
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 00:23
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

83% (00:48) correct 17% (01:10) wrong based on 199 sessions

HideShow timer Statistics

Manager
Manager
avatar
B
Joined: 28 Jun 2016
Posts: 215
Location: Canada
Concentration: Operations, Entrepreneurship
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 02:45
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


P(no blue & not red) = 4/12 =1/3

P(blue or red)= 1-1/3 = 2/3

D


Sent from my iPhone using GMAT Club Forum mobile app
Manager
Manager
User avatar
P
Status: Quant Expert Q51
Joined: 02 Aug 2014
Posts: 103
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 03:49
Blue + Red =8
Total number of balls is 6+2+4=12

So the answer is 8/12=2/3

Answer D
_________________
Senior Manager
Senior Manager
avatar
Joined: 06 Jun 2016
Posts: 254
Location: India
Concentration: Operations, Strategy
Schools: ISB '18 (D)
GMAT 1: 600 Q49 V23
GMAT 2: 680 Q49 V34
GPA: 3.9
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 04:06
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


Total number of balls=12
Red=6 Blue=2 Green=4
P(B or R)= P(B)+P(R)
P(B or R)= 6/12+ 2/12= 8/12= 2/3
Answer D
Math Expert
avatar
V
Joined: 02 Aug 2009
Posts: 7977
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 04:18
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


A straight application would be..
Either blue or red means NOT green..
Prob of green = 4/12=1/3..
Prob of NOT green = 1-1/3=2/3..
D
_________________
CEO
CEO
User avatar
D
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2978
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Reviews Badge
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 04:50
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


Probability = Favorable Outcome / Total Outcomes

probability of that it is either blue or red = (Total Blue or red balls) / Total Balls = 8/12 = 2/3

Answer: Option D
_________________
Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION
Board of Directors
User avatar
D
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4775
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 09 Nov 2016, 08:50
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


Required Probability = \(1 - \frac{4C_1}{12C_1}\) = \(1 - \frac{1}{3}\) = \(\frac{2}{3}\)

Hence, answer will be (D) \(\frac{2}{3}\)
_________________
Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
Intern
Intern
avatar
B
Joined: 11 Jan 2018
Posts: 19
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 27 Apr 2018, 00:00
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


Since its asking OR, you ADD the probability

Probability of Red:6/12
Probability of Blue: 2/12

6/12 + 2/12 = 8/12 ( simplified to 2/3)

D is the answer~
SVP
SVP
User avatar
V
Status: It's near - I can see.
Joined: 13 Apr 2013
Posts: 1684
Location: India
Concentration: International Business, Operations
Schools: INSEAD Jan '19
GPA: 3.01
WE: Engineering (Real Estate)
Reviews Badge CAT Tests
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 02 Jun 2018, 00:21
Bunuel wrote:
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


Total = 12 marbles

Probability of either blue or red = 6/12 + 2/12

= 1/2 + 1/6

= 2/3

(D)

_________________
"Do not watch clock; Do what it does. KEEP GOING."
Senior Manager
Senior Manager
User avatar
P
Joined: 12 Dec 2015
Posts: 428
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 02 Jun 2018, 02:23
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ball is drawn from the jar, what is the probability of that it is either blue or red?

A. 1/12
B. 1/4
C. 1/2
D. 2/3
E. 3/4


Ans: D
Details:
T= R+B+G
T = 12, R=6, B=2, & G=4,
P(R) = 6/12 & P (B) = 2/12
P(R or B) = P(R U B) = P(R) + P(B) = 6/12 + 2/12 = 8/12=2/3
Intern
Intern
avatar
S
Joined: 01 Jun 2015
Posts: 41
Location: India
Reviews Badge
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 02 Jun 2018, 02:57
P(no blue & not red) = 4/12 =1/3

P(blue or red)= 1-1/3 = 2/3

Hence D
Manager
Manager
avatar
B
Joined: 01 Jan 2019
Posts: 66
Location: Canada
Concentration: Finance, Economics
GPA: 3.24
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

New post 01 Feb 2019, 23:19
Ok, I don't know whether the method applied by me is correct or not. But just putting it here for any corrections though:

1. Total no of red balls: 6

P(Red Ball): 1/6

2. Total no of blue balls: 2

P(Blue Ball): 1/2

P(R+B)= 1/6+1/2= 2/3


Is this method correct? Just wondering
GMAT Club Bot
There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba   [#permalink] 01 Feb 2019, 23:19
Display posts from previous: Sort by

There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba

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





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