A newborn baby is equally likely to be male or female. What is the probability that a mother's first three children will all be girls?
The answer is 12.5% possibility that the mother's first three children will be girls.
$${\mathtt{0.5}}{\mathtt{\,\times\,}}{\mathtt{0.5}}{\mathtt{\,\times\,}}{\mathtt{0.5}} = {\frac{{\mathtt{1}}}{{\mathtt{8}}}} = {\mathtt{0.125}}$$
