A father has 3 children with at least one boy. The probability that he has 2 boys and one girl, ...

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A father has 3 children with at least one boy. The probability that he has 2 boys and one girl, is
(A) \( 1 / 4 \)
(B) \( 1 / 3 \)
(C) \( 2 / 3 \)
(D) none of these
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