Forty-seven employees in an office wear eyeglasses. Thirty-one have single-vision correction, and 16 wear bifocals. If two

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Forty-seven employees in an office wear eyeglasses. Thirty-one have single-vision correction, and 16 wear bifocals. If two employees are selected at random from this group, what is the probability that both of them wear bifocals? What is the probability that both have single-vision correction?
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