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In a class of 30 students, there are 17 girls and 13 boys.

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In a class of 30 students, there are 17 girls and 13 boys. [#permalink]  28 Jun 2008, 00:06
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In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Director
Joined: 12 Apr 2008
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Location: Eastern Europe
Schools: Oxford
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Kudos [?]: 176 [0], given: 4

Re: PS: Probability [#permalink]  28 Jun 2008, 03:36
Quote:
In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?

I got 19/30:

If three of A students are girls => 2 are boys.
P = P(choose any girl) + P(choose boy who is A) = 17/30 + 2/30 = 19/30.
Director
Joined: 27 May 2008
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Re: PS: Probability [#permalink]  28 Jun 2008, 03:48
G : set of all girls = 17
A : set of all A students = 5
GiA : G intersection A = 3
GUA : G union A

P(GUA) = P(G) + P(A) - P(GiA)
= 17/30 + 5/30 - 3/30
=19/30
Re: PS: Probability   [#permalink] 28 Jun 2008, 03:48
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In a class of 30 students, there are 17 girls and 13 boys.

 Powered by phpBB © phpBB Group and phpBB SEO 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®.
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
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In a class of 30 students, there are 17 girls and 13 boys.

Author Message
TAGS:
Director
Joined: 05 Jan 2008
Posts: 707
Followers: 3

Kudos [?]: 146 [0], given: 0

In a class of 30 students, there are 17 girls and 13 boys. [#permalink]  28 Jun 2008, 00:06
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

Director
Joined: 12 Apr 2008
Posts: 500
Location: Eastern Europe
Schools: Oxford
Followers: 12

Kudos [?]: 176 [0], given: 4

Re: PS: Probability [#permalink]  28 Jun 2008, 03:36
Quote:
In a class of 30 students, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl or an A student?

I got 19/30:

If three of A students are girls => 2 are boys.
P = P(choose any girl) + P(choose boy who is A) = 17/30 + 2/30 = 19/30.
Director
Joined: 27 May 2008
Posts: 550
Followers: 7

Kudos [?]: 209 [0], given: 0

Re: PS: Probability [#permalink]  28 Jun 2008, 03:48
G : set of all girls = 17
A : set of all A students = 5
GiA : G intersection A = 3
GUA : G union A

P(GUA) = P(G) + P(A) - P(GiA)
= 17/30 + 5/30 - 3/30
=19/30
Re: PS: Probability   [#permalink] 28 Jun 2008, 03:48
Similar topics Replies Last post
Similar
Topics:
3 There are n students in a class. Of them, k boys and k girls (includin 9 29 Jan 2015, 07:25
1 In a class of 30 students, 17 students study Chinese, and r 4 09 Sep 2010, 06:52
In a class of 30 students, there are 17 girls and 13 boys. 8 24 Oct 2008, 13:16
In a class of 30 students, 17 students study Chinese, and r 8 18 Nov 2007, 21:13
In a class of 30 students, 17 students study Chinese, and r 3 28 Oct 2007, 13:39
Display posts from previous: Sort by

In a class of 30 students, there are 17 girls and 13 boys.

 Powered by phpBB © phpBB Group and phpBB SEO 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®.
user
TYPE: SINGLE_QUESTION

The text passage provided contains a mathematical question about probability. It describes a class of 30 students, with 17 girls and 13 boys, and mentions that 5 students are A students, 3 of whom are girls. The question asks for the probability of choosing a girl or an A student at random from the class.

The answer to the question is not provided in the text, only the question itself is present.

TYPE: SINGLE_QUESTION