Garza Kelly
08/20/2024 · High School
10 Sete amigos (quatro rapazes e três raparigas) vão ao cinema, ficando sentados na mesma fila, em lugares consecutivos. De quantas maneiras se podem sentar, de modo que: 10.1 não fiquem dois rapazes juntos nem duas raparigas juntas? 10.2 pelo menos um dos extremos seja ocupado por um rapaz?
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10.1: 144 maneiras
10.2: 4896 maneiras
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