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data sufficiency

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data sufficiency [#permalink] New post 03 Jul 2008, 05:09
please help, I really don't understand it....
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
the answer is B
looks easy, but I don't understand why B
thanks in advance
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Re: data sufficiency [#permalink] New post 03 Jul 2008, 10:23
Zaur wrote:
please help, I really don't understand it....
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
the answer is B
looks easy, but I don't understand why B
thanks in advance


Answer can not be B since stmts 1) and 2) give the same information. Answer should be D (Explanation to follow).
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Re: data sufficiency [#permalink] New post 03 Jul 2008, 10:35
brokerbevo wrote:
Zaur wrote:
please help, I really don't understand it....
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
the answer is B
looks easy, but I don't understand why B
thanks in advance


Answer can not be B since stmts 1) and 2) give the same information. Answer should be D (Explanation to follow).


I'm assuming theres some kind of typo? Otherwise it should be D as the poster above stated.

stem1 gives 4 female students out of 21
stem2 gives 4 female students (9-5=4) out of 21
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Re: data sufficiency [#permalink] New post 10 Jan 2012, 06:50
1) 4/9 Statement 1 is sufficient
2) 9-5= 4/9 Statement 2 is also sufficient
Ans. D
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Re: data sufficiency   [#permalink] 10 Jan 2012, 06:50
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