Question

Suppose that each child born is equally likely to be a boy or a girl. Consider a family with exactly three children. 
Write the following events as a set and find its probability:
The event that at least two children are girls

Answer 1

Let B denote the event that at least two children are girls.

B = {GGB, GBG, BGG, GGG}

P(B) = `4/8`.