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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