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The shuffling of music is caused by a random permutation. This is when the objects (songs) are assigned random integer (number) values. After the numbers are assigned, the software shuffling the music uses a formula pre-created by the software engineers to decide which number is chosen next. That number, as written above, is a song. One of the most common randomization formulas is: Xn + 1 = aXn + b(mod m) Where (mod m) is the total number of numbers which the formula can produce. 100 songs, 100 numbers.
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