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Cual es la probabilidad de aprobar un examen de 12 preguntas, cada una con dos opciones, si se contesta al azar? Un codigo se compone

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Cual es la probabilidad de aprobar un examen de 12 preguntas, cada una con dos opciones, si se contesta al azar? Un codigo se compone de 2 letras distintas seguidas de 3 numeros. Se escoge un codigo al azar Cual es la pro- babilidad de que empiece con r y termine en numero par\f

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