Answer:
A certain company manufactures school materials, dedicating itself exclusively to production of cadernos, books and agendas. These matters are different types of finishing: just a brooch, just a spiral, a hard layer with a brooch and a hard layer with expiral. This company has five options of cores for a hard coat and three options of tamanho for or expiral, but it hardly produces agendas just as brool. How many variations of school subjects is this company producing?
