Two mathematicians, Tom and Smith are walking down the street. Tom: I know you have three sons. What are their ages? Smith: The product of their ages is 36. Tom: I can’t tell their ages from that. Smith: Well, the sum of their ages is the same as that address across the street. Tom: I still can’t tell. Smith: The eldest is visiting his grandfather today. Tom: Now I know their ages. Do you know the age of the kids?
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