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[JAVA] Número Aleatorio Math.random()

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Número aleatorio entre a y a + b, excluyendo a + b:
a + Math.random() * b

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  1. (int) (Math.random() * 10) 	// aleatorio entre 0 y 9
  2. 50 + (int) (Math.random() * 50) // aletario entre 50 y 99

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