NBC News on MSN: Life-threatening virus that causes vomiting and diarrhea at high levels in the US, CDC says It took just 48 hours for Ben Lopman’s 18-month-old son to go from being an energetic toddler to totally listless ... Life-threatening virus that causes vomiting and diarrhea at high levels in the US, CDC says So the Problem goes like this :- An old man had $17$ camels . He had $3$ sons and the man had decided to give each son a property with his camels.

Context Explanation

Unfortunately however, the man dies, and in his l... In case this is the correct solution: Why does the probability change when the father specifies the birthday of a son? (does it actually change? A lot of answers/posts stated that the statement does matter) What I mean is: It is clear that (in case he has a son) his son is born on some day of the week.

Insight Material

The only way to get the 13/27 answer is to make the unjustified unreasonable assumption that Dave is boy-centric & Tuesday-centric: if he has two sons born on Tue and Sun he will mention Tue; if he has a son & daughter both born on Tue he will mention the son, etc. Diophantus' childhood ended at $14$, he grew a beard at $21$, married at $33$, and had a son at $38$. Diophantus' son died at $42$, when Diophantus himself was $80$, and so Diophantus died four years later when he was $84$. Checks out! The father then randomly handed each son one of the two envelopes with a probability of $0.5$.

Final Conclusion

After both sons opened their envelopes, his father privately asked each son whether he wanted to switch his envelops with the one his brother had.