Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Aug 2016, 19:44

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Jean drew a gumball at random from a jar of pink and blue

Author Message
TAGS:

### Hide Tags

Manager
Joined: 22 Jan 2012
Posts: 90
Location: India
Concentration: General Management, Technology
GMAT 1: Q39 V29
GPA: 3.3
WE: Engineering (Consulting)
Followers: 6

Kudos [?]: 88 [1] , given: 9

Jean drew a gumball at random from a jar of pink and blue [#permalink]

### Show Tags

19 Mar 2012, 02:32
1
KUDOS
00:00

Difficulty:

25% (medium)

Question Stats:

93% (01:15) correct 7% (00:00) wrong based on 15 sessions

### HideShow timer Statistics

Jean drew a gumball at random from a jar of pink and blue gumballs. Since the gumball she selected was blue and she wanted a pink one, she replaced it and drew another. The second gumball also happened to be blue and she replaced it as well. If the probability of her drawing the two blue gumballs was 9/49, what is the probability that the next one she draws will be pink?

A. 1/49
B. 4/7
C. 3/7
D. 16/49
E. 40/49
[Reveal] Spoiler: OA

_________________

Press +1 Kudos rather than saying thanks

Ill be posting good questions as many as I can...

Towards Success

Last edited by Bunuel on 19 Mar 2012, 03:16, edited 1 time in total.
VP
Joined: 24 Jul 2011
Posts: 1018
GMAT 1: 780 Q51 V48
GRE 1: 1540 Q800 V740
Followers: 108

Kudos [?]: 481 [0], given: 18

Re: Jean drew a gumball at random from a jar of pink and blue gu [#permalink]

### Show Tags

19 Mar 2012, 02:45
The probability of drawing a pink gumball both times is the same. The probability that she drew two blue gumballs = 9/49 = (3/7) * (3/7)

Therefore probability that the next one she draws is pink = 4/7

Option (B)
_________________

GyanOne | Top MBA Rankings and MBA Admissions Blog

Premium MBA Essay Review|Best MBA Interview Preparation|Exclusive GMAT coaching

Get a FREE Detailed MBA Profile Evaluation | Call us now +91 98998 31738

Math Expert
Joined: 02 Sep 2009
Posts: 34457
Followers: 6279

Kudos [?]: 79676 [0], given: 10022

Re: Jean drew a gumball at random from a jar of pink and blue gu [#permalink]

### Show Tags

19 Mar 2012, 03:13
iwillcrackgmat wrote:
Jean drew a gumball at random from a jar of pink and blue gumballs. Since the gumball she selected was blue and she wanted a pink one, she replaced it and drew another. The second gumball also happened to be blue and she replaced it as well. If the probability of her drawing the two blue gumballs was 9/49, what is the probability that the next one she draws will be pink?

A. 1/49
B. 4/7
C. 3/7
D. 16/49
E. 40/49

The probability of picking a blue gum is $$\frac{blue}{total}$$, the probability of picking two blue gums in a row (with replacement) is $$\frac{blue}{total}*\frac{blue}{total}$$ --> $$\frac{blue}{total}*\frac{blue}{total}=\frac{9}{49}$$ --> $$\frac{blue}{total}=\frac{3}{7}$$.

Since there are ONLY pink and blue gums in the jar then the probability of picking pink would be $$1-\frac{3}{7}=\frac{4}{7}$$.

_________________
Intern
Joined: 19 Mar 2012
Posts: 2
Followers: 0

Kudos [?]: 0 [0], given: 4

Re: Jean drew a gumball at random from a jar of pink and blue [#permalink]

### Show Tags

19 Mar 2012, 09:15
thanks for the question.
It appeared like a tough one.
Manager
Joined: 22 Jan 2012
Posts: 90
Location: India
Concentration: General Management, Technology
GMAT 1: Q39 V29
GPA: 3.3
WE: Engineering (Consulting)
Followers: 6

Kudos [?]: 88 [0], given: 9

Re: Jean drew a gumball at random from a jar of pink and blue [#permalink]

### Show Tags

19 Mar 2012, 09:20
These are the questions which generally confuse us with their wordiness..
Welcome to gmat :D
_________________

Press +1 Kudos rather than saying thanks

Ill be posting good questions as many as I can...

Towards Success

Re: Jean drew a gumball at random from a jar of pink and blue   [#permalink] 19 Mar 2012, 09:20
Similar topics Replies Last post
Similar
Topics:
1 In a particular gumball machine, there are 4 identical blue gumballs, 1 08 Apr 2016, 02:44
7 A miniature gumball machine contains 7 blue, 5 green, and 4 red gumbal 7 08 Jul 2015, 03:10
5 A jar is filled with red, white, and blue tokens that are eq 7 11 Nov 2013, 20:23
2 A gumball machine contains 7 blue, 5 green, and 4 red 6 22 Oct 2012, 01:22
1 A jar contains 20 red, 20 blue, 6 yellow and 4 pink balls 6 17 Mar 2012, 07:28
Display posts from previous: Sort by