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Mathematics

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Svp aidez moi je suis nul en maths
Lucie met la mine de son crayon dans le trou A du petit engrenage qui comporte 18 dents et commence à le faire tourner dans le grand cercle, fixé sur son bureau, qui comporte 56 dents. Combien de fois le grand cercle aura-t-il été parcouru lorsque le point A reprendra, pour la première fois, sa position initiale ?

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