A certain basket contains 10 apples, 7 of which are red and 3 of which are green. If 3 different apples are to be selected at random from the basket, what is the probability that 2 of the apples selected will be red and 1 will be green?
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A \frac{7}{10}
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B \frac{7}{20}
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C \frac{49}{100}
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D \frac{21}{40}
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E \frac{7}{40}