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En una caja hay boletos numerados del 1 al 20 inclusive, y se sacan dos, uno a continuacin del otro sin remplazar el primero. Cul
- En una caja hay boletos numerados del 1 al 20 inclusive, y se sacan dos, uno a continuacin del otro sin remplazar el primero. Cul es la probabilidad de que:
a.Ambos sean pares
b.El primero sea par y el segundo impar
Ambos sean pares o impares
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