2 ms·
The reason is that the two children are different dimensions in the probability space. Both (one-kid, other-kid), and (first-born, second-born) yield the same s
by jballanc 18y ago
The reason is that the two children are different dimensions in the probability space. Both (one-kid, other-kid), and (first-born, second-born) yield the same space, and both will give a 1/3 answer.
- psyklic 18y agoPeople interpret "one kid is a boy" as "first-born is a boy" in my example above (i.e. they selectively choose which kid is the "one kid" -- the one which is a boy), which yields 1/2. People seem to be good at enumerating the "probability space" quite well. They just don't understand why the dimensions are what they are.