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

 It is currently 18 Oct 2019, 01:44 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

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.  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

Math Expert 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 00:00

Difficulty:   5% (low)

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

HideShow timer Statistics

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

_________________
Manager  B
Joined: 28 Jun 2016
Posts: 215
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

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  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

Blue + Red =8
Total number of balls is 6+2+4=12

So the answer is 8/12=2/3

_________________
Senior Manager  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

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
Math Expert 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

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  D
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2978
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

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

_________________
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 D
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4775
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

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  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

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  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)
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

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  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

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  S
Joined: 01 Jun 2015
Posts: 41
Location: India
Re: There are 12 balls in a jar: 6 red, 2 blue and 4 green. If a single ba  [#permalink]

Show Tags

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

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

Hence D
Manager  B
Joined: 01 Jan 2019
Posts: 66
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

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 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  