Question

Given that a couple decides to have 4 children, none of them adopted. What is the probability their children will be born in the order boy, girl, boy, girl?

Show your work.

Answer 1

1/8 because 1/2 + 1/2 + 1/2 +1/2

Answer 2

Look at the chart above.
The first child may be a boy or a girl.
The second child may be a boy or a girl following a boy, or it may be a boy or a girl following a girl, etc.
Each line below represents the next child.