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

 It is currently 16 Aug 2018, 22:24

### 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

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

Author Message
TAGS:

### Hide Tags

Manager
Status: The journey is always more beautiful than the destination
Affiliations: Computer Science
Joined: 24 Apr 2017
Posts: 56
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

Updated on: 09 Apr 2018, 01:21
1
00:00

Difficulty:

5% (low)

Question Stats:

98% (00:35) correct 2% (00:16) wrong based on 65 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
Joined: 05 Feb 2016
Posts: 144
Location: India
Concentration: General Management, Marketing
WE: Information Technology (Computer Software)
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

### Show Tags

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
Joined: 27 Aug 2014
Posts: 101
Concentration: Finance, Strategy
GPA: 3.9
WE: Analyst (Energy and Utilities)
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

### Show Tags

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
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick &nbs [#permalink] 04 Jun 2018, 13:55
Display posts from previous: Sort by

# Events & Promotions

 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®.