Ok. Thanks. So:
p(bus has number ≤ 1546 | city has 2992 buses) = 0.5
implies
p(city has < 2992 buses | bus has number 1546) = 0.5
?
If that is your reasoning, I do not see how you go from the former to the latter.
Is it a general fact that:
p(bus has number ≤ n | city has N buses) = p(city has < N buses | bus has number n)
or does it work only for 0.5?
Oh, it looks exactly like the kind of reference that everyone here seems to be aware of and I am not. ^^ I will be reading that. Thanks a lot.