Question

There are 2 children in the family.Find the probability that
a) at least one of them is a boy
b) at least two of them are boys
c) there is one girl in the family

Answer 1

think of this as flipping two coins, heads is boys, tails is girls
the possibilities are
(H,H), (H, T), (T, H), (T, T) and each of these 4 is equally likely

Answer 2

at least one head is (H,H), (T,H), (H,T) so \(\frac{3}{4}\) for that one