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data sufficiency

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Intern
Joined: 17 Dec 2006
Posts: 39
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data sufficiency [#permalink]  03 Jul 2008, 04:16
a total of 9 women and 12 men reside in the 21 apartment that are in a certain apartment building, one person to each apartment. If a pool taker is to select one of the apartments at random, what is the probability that the resident of the apartment selected will be a women who is a student?
1) of the women, 4 are student
2) of the women, 5 are not student
looks easy, but I don't understand why B
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Joined: 09 Oct 2007
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Re: data sufficiency [#permalink]  03 Jul 2008, 07:09
I remember seeing this question as an example in the MGMAT online course. I'm pretty sure answer was D.

from 1) 4/21
from 2) (9-5)/21
Re: data sufficiency   [#permalink] 03 Jul 2008, 07:09
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