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Poly noël maths


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Dans le sujet de Maths 1, pour le QCM 13 p 196, je ne comprends pas comment les effectifs attendus à la question C peuvent être 50

Par exemple pour la case 1, je fais 120x100/300 et du coup ça fait 40 mais je comprends pas mon erreur parce que pourtant il me semble que c'est celle-là la formule dans le cours...

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