Marty, that is certainly one way to look at it - indeed it is really a restricted choice argument.
But perhaps it’s simpler to note that the probability that two children are the same sex is 50%. And if this changed when someone answered “boy”, then by symmetry it would ...
I don’t see the relevance of your comment to mine.
In both my examples we know for a fact he has 2 children at least one of which is a boy but the answers are different (essentially because in the second case with a boy and a girl he ...
With all questions of this kind the answers depend on how you obtained the information.
Take question 2 for example. If you ask Mr Jones “Do you have exactly 2 children?” And “is at least one of them a boy” and he answers yes both times then the chance that ...
On the last page you mention you don’t play a strong 2NT opening. And if I recall you play a 10-12NT in some positions. How exactly do you show all your possible NT ranges?