Answer:
Step-by-step explanation:
10
The sample space is S={(g,g),(g,b),(b,g),(b,b)}, where b is for boy, g is for girl the first element of the tuple is the eldest.
Let B the event the eldest is a girl, so B={(g,b),(g,g)}.
A is the event where the two children are girls. A={(g,g)}.
