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May
5
comment Boy Born on a Tuesday - is it just a language trick?
The same question can be asked on Khovanova. She says: Now let me give you a variation of the Tuesday-Child problem that is unambiguous and where the answer is 13/27: You pick a random father of two children and ask him, “Yes or no, do you have a son born on a Tuesday?”. If the answer is yes, what is the probability that the father has two sons? The 13/27 argument works perfectly in this case. Why there its unambiguous? There I also can ask "Do you have a son born on some weekday?" and he answer "Yes". The same problem exists.
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awarded  Editor
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revised Boy Born on a Tuesday - is it just a language trick?
Fixed typos. Rephrasing the question.
May
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comment Boy Born on a Tuesday - is it just a language trick?
This is discussed also on johncarlosbaez.wordpress.com/2010/08/24/… But there is no answer there. If instead of “born on a Tuesday” your colleague says “born on—now let me think…..ah yes: it was a Tuesday.” John say: " I would argue, in the hesitation variant, that you should switch from 1/3 to 1/2 even before you hear the day: the hesitation is crucial while the day is irrelevant. For the original, unhesitant, “born on a Tuesday” case, 13/27 is correct." How the hesitation is relevant?
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answered Boy Born on a Tuesday - is it just a language trick?
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May
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answered Unfamiliar Set operation