Question

A family has seven sons. The chance that their eighth child will be a daughter is _____.

one chance in seven
one chance in eight
one chance in two
practically none

Answer 1

The answer for the above question is One chance in two.
One chance in two because the parent can only bare a son or a daughter, therefore getting a daughter would give a probability of half and getting a son would give a probability of a half. These are the only possible outcomes getting a daughter or a son.