Математическая задачка

Mike has only two children, and they are called Pat and Alex, which could equally be boys’ or girls’ names. In fact, Pat is a girl. What is the probability that Alex is a boy?

a) 50%
b) Slightly less than 50%
c) Slightly more than 50%
d) Between 60% and 70%
e) Between 40% and 30%

Перевод на лепре. Но там прямо первым комментарием правильный ответ.

Теперь я все понял.

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