There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes. Unfortunately there is no readily available research into the genders of seven or more children to establish the experimental probability for such an outcome.
However, if you assume that they are independent events then, 메이저파워볼, given that the probability of a girl is approx 0.48, then the probability of the seventh child being a girl is 0.48.
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