From a group of 3 boys and 3 girls, 4 children are to be randomly selected. What is the probability that equal numbers of boys and girls will be selected?
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A$$\frac{1}{10}$$
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B$$\frac{4}{9}$$
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C$$\frac{1}{2}$$
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D$$\frac{3}{5}$$
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E$$\frac{2}{3}$$
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正确答案: D