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11. En una urna tenemos bolas de diversos colores: 20 son negras, 50 son rojas, 50 son azules, 60 son verdes y 70 son blancas.

11. En una urna tenemos bolas de diversos colores: 20 son negras, 50 son rojas, 50 son azules, 60 son verdes y 70 son blancas. Determina la probabilidad de: A) seleccionar una bola roja B) Seleccionar una bola roja o negra ( favor mostrar calculos)

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