Question

Given a family with three ​children, find the probability of the event. The oldest two are boys, given that the oldest is a boy. The probability that the oldest two are boys, given that the oldest is a boy is?

Answer 1

1/2

Explanation:

List the possibilities

b b g

b b b

b g b

b g g two out of four have oldest two boys 2/4 = 1/2