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Mathematics, 24.02.2021 03:50 jahsehsgold

9. Con 12 libros de diferentes autores, cuántas selecciones de 7 libros se pueden hacer si:

a. Un libro determinado se incluye siempre.

b. Un libro determinado nunca se incluye.​

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9. Con 12 libros de diferentes autores, cuántas selecciones de 7 libros se pueden hacer si:
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