Question

a family has 2 children. what is the probability that both the children are boys given that at least one of them is a boy

Answer 1

ODDS = (0B, 2G), (1B, 1G), (2B,0G)

there is a 1 in 3 chance that there are 2 boys

there is a 2 in 3 chance that at least 1 of them is a boy.

Answer 2

sample space {b,b} ,{g b},{b g},{g g}.
lt A be the set at least one is boy {bb}{gb}{bg}
B be the set of both boy{bb}
conditional provability p(B/A)=1/3