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Una caja contiene 2 bolas rojas y 3 azules. Hallar la probabilidad de que si dos bolas se extraen aleatoreamente (sinb reemplazamiento) a) Ambas sean azules Evento 1 : primero sea azul, 2 : segunda sea azul 2 3  (1 ) =   (2 ) =  5 5  (2 j 1 ) =  (1 )  (2 ) !

3 5

2 3 = 4 10

b) Ambas sean rojas Evento 1 : primero sea roja, 2 : segunda sea roja 2 1  (1 ) =   (2 ) =  5 4 1 2 1 = 5 4 10 c) Una sea roja y la otra sea azul Evento 1 : primero sea roja, 2 : segunda sea azul 3 2  (1 ) =   (2 ) =  5 4  (2 j 1 ) =  (1 )  (2 ) !

2 3 3 = 5 4 10 En la solucion c) veo que estos son los valores para el evento uno y dos, pero el libro me da otro resultado, no se si es error del libro o hay algo por alli que no he sabido resolver  (2 j 1 ) =  (1 )  (2 ) !

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