a woman has 7 children ,and exactly half of them are boys.how is it possible?

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a woman has 7 children ,and exactly half of them are boys.how is it possible?
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a woman has 7 children ,and exactly half of them are boys.how is it possible?
a woman has 7 children ,and exactly half of them are boys.how is it possible?

a woman has 7 children ,and exactly half of them are boys.how is it possible?
Because another children is not yet born and its sex is still unknown.因为另一个孩子尚未诞生,还不知道性别.