A dry cleaning firm has 12 employees: 7 women and 5 men. Three of the women and

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A dry cleaning firm has 12 employees: 7 women and 5 men. Three of the women and five of the men are 40 years old or older. The remainder are over 20 years old and under 40. If a person is chosen at random from this firm, what is the probability that the person is
(a) A woman?
(b) Under 40 years of age?
(c) 20 years old?
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