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15 Dec 2014, 09:26
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D
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Difficulty:
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90% (00:59) correct
10%
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wrong
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A total of 9 women and 12 men reside in the 21 apartments that are in a certain apartment building, one person to each apartment. If a poll taker 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) Of the women, 4 are students.
(2) Of the women, 5 are not students.
(1) Of the women, 4 are students.
(2) Of the women, 5 are not students.
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15 Dec 2014, 10:41
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statement 1: sufficient
If 4 of the women are students, the chance of randomly selecting 1 among the 21 apartments is 4/21
statement 2: sufficient
If 5 of the women are not students, then 9-5=4 of the women are students. Same as above.
Answer D!
If 4 of the women are students, the chance of randomly selecting 1 among the 21 apartments is 4/21
statement 2: sufficient
If 5 of the women are not students, then 9-5=4 of the women are students. Same as above.
Answer D!
12 Mar 2016, 10:34
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I thought that the correct answer is A.
The statement 2 claims that: of the women, 5 are not students. But, it does no mean that the other 4 are students. They could be workers, teachers, etc. if the other 4 are students, the probability is 4 / 21. If not, we do not know. So, statement 2 is not sufficient....
The statement 2 claims that: of the women, 5 are not students. But, it does no mean that the other 4 are students. They could be workers, teachers, etc. if the other 4 are students, the probability is 4 / 21. If not, we do not know. So, statement 2 is not sufficient....
