The risk of some congenital illnesses increases with the age of the mother. Since there is no information about that, it is not possible to give a more useful answer to the question.
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1 in 2 children born will be male.
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most likely 1 out of five chance
If the gender of a child were an independent variable then the genders of the existing children would be irrelevant and so the probability of the next child being a girl would be approximately 1/2.It would be approximately 1/2 because the overall proportion is not exactly half. However, and more important, is the fact that the gender of a child is affected by the parents' genes and so is not independent of the gender of previous children.
no adjacent means "next to something"