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Mathematics
Mathematics
Europe
Wie lang sind die Seiten?
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Spektrum.de
Europe
Welche Zahl ist gesucht?
Science
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Puzzle
Spektrum.de
South America
Dia da Matemática: conheça a Constante de Kaprekar, regra aritmética que permite encontrar número 'secreto' em subtrações de quatro algarism
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