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En un grupo de 15 estudiantes extranjeros hay 6 alemanes, 5 franceses y 4 italianos. Si elegimos 5 personas y se sientan en fila. Cul
En un grupo de 15 estudiantes extranjeros hay 6 alemanes, 5 franceses y 4 italianos. Si elegimos 5 personas y se sientan en fila. Cul es la probabilidad de que:
a) El primero y el ltimo sean franceses
b)El primero y el ultimo sean de igual nacionalidad
c) El primero debe de ser francs y el segundo no lo sea
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