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Lundi, 13 janvier 2020
- How many times a day does a clock’s hands overlap?
- Explain a database in three sentences to your eight-year-old nephew. - In a country in which people only want boys, every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country? - How many piano tuners are there in the entire world? Rétroliens
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