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Coffee Machine - Colegiul National C. Negruzzi (Iași - Roumanie)

Titre du sujet: 
Coffee Machine
Our task refers to a coffee machine which accepts as payment only 1$ bills and 50 cent or 1$ coins. We found out in how many ways can we introduce in the machine exactly 15$, if the order of money entry IS or is NOT important, then we changed th hypothesis and we obtained several results related to various demands.
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Sujet | by Dr. Radut