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MGSM / Billy verkauft DVDs. Er hat am Dienstag 8 Kunden. Seine ersten 3 Kunden kaufen…

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Billy verkauft DVDs. Er hat am Dienstag 8 Kunden. Seine ersten 3 Kunden kaufen jeweils eine DVD. Seine nächsten 2 Kunden kaufen jeweils 2 DVDs. Seine letzten 3 Kunden kaufen keine DVD. Wie viele DVDs hat Billy am Dienstag verkauft?

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