Question

A couple has two children. Find the probability that both are boys, fit is known that (a) one of the children is a boy (b) older child is a boy. Select the correct answer from above options

Answer 1

(a) Let A: both are boys = {B, B}, n(A) = 1 Let B: One of the child is boy = {BG, BB, GB} = n(B) = 3 (b) Let C: Elder child is a boy c = {BG,BB} ⇒ n(c) = 2 4