Given equal probabilities of the birth of a boy or girl, if a pair of siblings contains at least one boy, what is the probability that both children are boys?

Question

Quizplus · Accepted Answer

Given the condition that there is at least one boy in the pair of siblings, the possible combinations are Boy-Girl, Girl-Boy, and Boy-Boy. Out of these three equally likely scenarios, only one scenario is both children being boys. Therefore, the probability is 1/3.

Given Equal Probabilities of the Birth of a Boy or Girl