4 ms·

What if they are twins? The explanation does not cover that and it sure changes the probabilities.

• klodolph 13y ago
  If we're going to bring reality into this, I think we have to take into account the fact that only very weird people tell you that "at least one child is a boy born on a Tuesday" and we have to consider the possibility that they are lying in order to test your knowledge of probability.
  • hudibras 13y ago
    And if we're really going to bring reality into this, then we'll need to consider the ages of the children, because of the at-birth sex ratio (105 newborn boys for every 100 newborn girls[0]) and differing mortality rates for each sex. [0]http://en.wikipedia.org/wiki/Human_sex_ratio http://en.wikipedia.org/wiki/Human_sex_ratio
  • chris_wot 13y ago
    I think it's probably good to be precise in this case. It should state that "at least one child is a boy born on a Tuesday, but one is older than the other by at least a day".