If the older child is the boy born on Tuesday, you have 7 chances the younger child is a boy. If the younger child is a boy born on Tueday, you only have 6 cha

If the older child is the boy born on Tuesday, you have 7 chances the younger child is a boy. If the younger child is a boy born on Tueday, you only have 6 chances the older child is a boy. This is because the 7th chance (older is a boy born on Tueday) was covered in the first scenario. Summarized from: http://www.sciencenews.org/view/generic/id/60598/title/Math_Trek__When_intuition_and_math_probably_look_wrong http://www.sciencenews.org/view/generic/id/60598/title/Math_...