Method rand

java/Chapter 18/Question18_3/Question.java:8–10

(int lower, int higher)

	/* Random number between lower and higher, inclusive */
	public static int rand(int lower, int higher) { 
		return lower + (int)(Math.random() * (higher - lower + 1));
	}

	/* pick M elements from original array.  Clone original array so that
	 * we don�t destroy the input. */