Davey Griffiths
10/30/2023 · Primary School

Un alumno tiene que elegir 7 de las 10 preguntas de un examen. ¿De cuántas maneras puede elegirlas? ¿Y si las 4 primeras son obligatorias?

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Sin restricciones: 120 maneras. Con las 4 primeras preguntas obligatorias: 20 maneras.

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