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# In a 21 apartment building, there are in total 12 men and 9 women, eac

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Retired Moderator
Joined: 27 Oct 2017
Posts: 1256
Location: India
GPA: 3.64
WE: Business Development (Energy and Utilities)
In a 21 apartment building, there are in total 12 men and 9 women, eac  [#permalink]

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30 Mar 2018, 23:03
00:00

Difficulty:

35% (medium)

Question Stats:

83% (00:44) correct 17% (01:02) wrong based on 12 sessions

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In a 21 apartment building, there are in total 12 men and 9 women, each of whom resides in a
different apartment. If a poll taken is to select one of the apartments at random, what is the
probability that the resident of the apartment selected will be a woman who is a student?

(1) Among the women, four are students.
(2) Among the women, five are not students.

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Intern
Joined: 15 Jan 2018
Posts: 1
Re: In a 21 apartment building, there are in total 12 men and 9 women, eac  [#permalink]

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30 Mar 2018, 23:29
4/21 - ans is D

Sent from my A1601 using GMAT Club Forum mobile app
Retired Moderator
Joined: 27 Oct 2017
Posts: 1256
Location: India
GPA: 3.64
WE: Business Development (Energy and Utilities)
Re: In a 21 apartment building, there are in total 12 men and 9 women, eac  [#permalink]

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31 Mar 2018, 00:18
Providing your approach / doubts to the problem would be appreciated.

4/21 - ans is D

Sent from my A1601 using GMAT Club Forum mobile app

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Joined: 02 Sep 2009
Posts: 58340
Re: In a 21 apartment building, there are in total 12 men and 9 women, eac  [#permalink]

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31 Mar 2018, 01:07
gmatbusters wrote:
In a 21 apartment building, there are in total 12 men and 9 women, each of whom resides in a
different apartment. If a poll taken is to select one of the apartments at random, what is the
probability that the resident of the apartment selected will be a woman who is a student?

(1) Among the women, four are students.
(2) Among the women, five are not students.

Discussed here: https://gmatclub.com/forum/a-total-of-9 ... 90081.html
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Re: In a 21 apartment building, there are in total 12 men and 9 women, eac   [#permalink] 31 Mar 2018, 01:07
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