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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Factorials were someone's attempt to make math look exciting!!!