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To each his own mania - Lycée Arago (Perpignan)

Titre du sujet: 
To each his own mania
Établissement:
Année:
Sujet jumelé ?: 
Non
Résumé: 
You are fond of counting, it is almost a mania. When you see a number, you add its digits up and, if this sum divides the number you started with, you feel good! How often does it happen?
Mots clés:
Nombre d'élèves : 
4


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