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

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Manager
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]

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Updated on: 09 Apr 2018, 01:21
2
00:00

Difficulty:

5% (low)

Question Stats:

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

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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

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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]

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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: 131
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]

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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
Joined: 27 May 2012
Posts: 583
A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

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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
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]

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29 Aug 2018, 08:54
total possible outcomes=19
desirable outcomes=7+3=10
probability=10/19
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Hasnain Afzal

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

Director
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Posts: 793
Concentration: Strategy, General Management
Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick  [#permalink]

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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
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]

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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.

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Jeffery Miller

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

Re: A bag contains 7 red, 9 yellow, and 3 black balls. If a ball is pick &nbs [#permalink] 03 Sep 2018, 19:00
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