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MGSM / Billy vend des DVD. Ce mardi, il a 8clients. Ses 3 premiers clients achètent…

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Billy vend des DVD. Ce mardi, il a 8clients. Ses 3 premiers clients achètent chacun un DVD. Les 2 clients suivants en achètent chacun 2. Les 3 derniers n'en achètent aucun. Combien de DVD Billy a-t-il vendus mardi ?

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